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Definition and classification of new materials

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Definition and classification of new materials

How are new materials defined and classified? Let’s first look at the definition of new materials:

New materials refer to those materials that have emerged or are already developing and have excellent properties and special functions that traditional materials do not have. There is no clear boundary between new materials and traditional materials. New materials are developed on the basis of traditional materials. Traditional materials can be developed into new materials through improvements in composition, structure, design and process to improve material performance or have new properties.

Definition and classification of new materials

Definition and classification of new materials

Main fields of new materials

As the foundation and forerunner of high-tech, new materials have a very wide range of applications. Together with information technology and biotechnology, they have become the most important and most promising fields in the 21st century. Like traditional materials, new materials can be classified from many different perspectives such as structural composition, function and application field. Different classifications are intertwined and nested. At present, new materials are generally divided into the following main fields according to application fields and current research hotspots:
Electronic information materials, new energy materials, nanomaterials, advanced composite materials, advanced ceramic materials, ecological environment materials, new functional materials (including high-temperature superconducting materials, magnetic materials, diamond films, functional polymer materials, etc.), biomedical materials, high-performance structural materials, intelligent materials, new building and chemical new materials, etc.

Electronic information materials

Electronic information materials refer to materials used in the fields of microelectronics, optoelectronic technology and new component basic products, mainly including semiconductor microelectronic materials represented by single crystal silicon; optoelectronic materials represented by laser crystals; electronic ceramic materials represented by dielectric ceramics and thermosensitive ceramics; magnetic materials represented by neodymium iron boron (NdFeB) permanent magnet materials; optical fiber communication materials; data storage materials mainly based on magnetic storage and optical disk storage; piezoelectric crystals and thin film materials; green battery materials represented by hydrogen storage materials and lithium ion embedding materials, etc. These basic materials and their products support the development of modern information industries such as communications, computers, information appliances and network technologies.
The overall development trend of electronic information materials is towards large size, high uniformity, high integrity, as well as thin film, multifunctionality and integration. Current research hotspots and technological frontiers include third-generation semiconductor materials represented by wide-bandgap semiconductor materials such as flexible transistors, photonic crystals, photonic crystals, SiC, GaN, ZnSe, organic display materials, and various nanoelectronic materials.

New energy materials

New energy and renewable clean energy technology is one of the five most decisive technical fields in the development of the world economy in the 21st century. New energy includes primary energy such as solar energy, biomass energy, nuclear energy, wind energy, geothermal energy, ocean energy, and hydrogen energy in secondary power sources. New energy materials refer to the key materials used to realize the transformation and utilization of new energy and the development of new energy technology. They mainly include nickel-hydrogen battery materials represented by hydrogen storage electrode alloy materials, lithium-ion battery materials represented by lithium-carbon negative electrodes and LiCoO2 positive electrodes, fuel cell materials, solar cell materials represented by Si semiconductor materials, and reactor nuclear energy materials represented by uranium, deuterium, and tritium.
Current research hotspots and technological frontiers include high-energy hydrogen storage materials, polymer battery materials, medium-temperature solid oxide fuel cell electrolyte materials, and polycrystalline thin-film solar cell materials.

Nanomaterials

Nanomaterials are a general term for zero-dimensional, one-dimensional, two-dimensional, and three-dimensional materials with small size effects composed of ultrafine particles with a size less than 100nm (0.1-100nm). The concept of nanomaterials was formed in the mid-1980s. Since nanomaterials exhibit unique optical, electrical, magnetic, thermal, mechanical, and mechanical properties, nanotechnology has rapidly penetrated into various fields of materials and has become a hot topic in the current world scientific research. According to physical form, nanomaterials can be roughly divided into five categories: nanopowders, nanofibers, nanofilms, nanoblocks, and nanophase-separated liquids. Although the nanomaterials that have been industrialized are mainly nanopowder materials such as calcium carbonate, white carbon black, and zinc oxide, and others are basically still in the primary research stage of the laboratory, and large-scale application is expected to be 5-10 years later, there is no doubt that nanotechnology represented by nanomaterials will have a profound impact on the economic and social development of the 21st century.
Current research hotspots and technological frontiers include: nano-assembly materials represented by carbon nanotubes; high-performance nanostructured materials such as nano-ceramics and nano-composites; design and synthesis of nano-coating materials; development of nano-electronic devices such as single-electron transistors, nano-lasers and nano-switches, and C60 ultra-high-density information storage materials.

Advanced composite materials

Composite materials are materials with two or more phase structures composed of two or more materials with different properties through physical and chemical compounding. This type of material not only has better performance than any single material in the composition, but also has unique properties that the components alone do not have.
Composite materials can be divided into two categories according to their use: structural composite materials and functional composite materials. Structural composite materials are mainly used as materials for load-bearing structures. They are composed of reinforcement components that can bear loads (such as glass, ceramics, carbon, polymers, metals, natural fibers, fabrics, whiskers, sheets and particles, etc.) and matrix components that can connect the reinforcements to form a whole material and transmit force (such as resin, metal, ceramics, glass, carbon and cement, etc.). Structural materials are usually divided into polymer-based composites, metal-based composites, ceramic-based composites, carbon-based composites and cement-based composites according to the different matrices. Functional materials refer to composite materials that provide other physical, chemical, biological and other properties in addition to mechanical properties. There are many types of composite materials, including piezoelectric, conductive, radar stealth, permanent magnet, photochromic, sound absorption, flame retardant, bio-self-absorption, etc., which have broad development prospects. In the future, the proportion of functional composite materials will exceed that of structural composite materials and become the mainstream of composite material development. The research direction of composite materials in the future will mainly focus on nanocomposites, bionic composite materials, and the development of multifunctional, smart and intelligent composite materials.

Eco-environmental materials

Eco-environmental materials were proposed in the context of human beings’ awareness of the important strategic significance of ecological and environmental protection and the fact that countries around the world are taking the path of sustainable development. They are an inevitable trend in the development of materials science and engineering research at home and abroad. It is generally believed that eco-environmental materials are materials that have satisfactory performance and are endowed with excellent environmental coordination.
The characteristics of this type of material are that it consumes less resources and energy, has little pollution to the ecology and environment, has a high recycling rate, and is in harmony with the ecological environment throughout the entire life cycle from material manufacturing, use, disposal to recycling and recycling. Mainly include: environmentally compatible materials, such as pure natural materials (wood, stone, etc.), biomimetic materials (artificial bones, artificial organs, etc.), green packaging materials (green packaging bags, packaging containers), ecological building materials (non-toxic decorative materials, etc.); environmentally degradable materials (biodegradable plastics, etc.); environmental engineering materials, such as environmental restoration materials, environmental purification materials (molecular sieves, ion sieve materials), environmental alternative materials (phosphorus-free laundry detergent additives), etc.

The research hotspots and development directions of eco-environmental materials include the design of recycled polymers (plastics), the theoretical system of material environmental coordination evaluation, and new processes, new technologies and new methods to reduce the environmental load of materials.

Biomedical materials

Biomedical materials are a new type of high-tech materials used to diagnose, treat or replace human tissues and organs or enhance their functions. They are a new and developing field in materials science and technology. They not only have high technical content and economic value, but are also closely related to the life and health of patients. In the past 10 years, the market for biomedical materials and products has maintained a growth rate of about 20%.

Biomedical Materials

Biomedical Materials

Biomedical materials are divided into medical metal materials, medical polymer materials, bioceramic materials and biomedical composite materials according to material composition and properties. Metals, ceramics, polymers and their composite materials are the most widely used biomedical materials. According to the application, biomedical materials can be divided into degradable and absorbable materials, tissue engineering materials and artificial organs, controlled release materials, bionic intelligent materials, etc.

The research and development directions of biomedical materials are mainly:

  • (1) Improvement and development of biocompatibility evaluation of biomedical materials
  • (2) Research on new degradable materials
  • (3) Research on artificial organs and tissue materials with comprehensive physiological functions
  • (4) Research on new drug carrier materials
  • (5) Research on material surface modification

Smart Materials

In the mid-1980s, people proposed the concept of smart materials (Smart Materials or Intelligent Material System): Smart materials imitate life systems, can sense environmental changes and change one or more of their own performance parameters in real time, and make desired composite materials or composite materials that can adapt to the changed environment.
Smart materials are a complex material system that integrates materials and structures, intelligent processing, execution systems, control systems and sensor systems. Its design and synthesis span almost all high-tech disciplines. The basic material components that constitute smart materials include piezoelectric materials, shape memory materials, optical fibers, electro-(magneto-)rheological fluids, magnetostrictive materials and smart polymer materials.

The emergence of smart materials will bring human civilization to a new height, but it is still a certain distance away from the practical stage.

Future research focuses include the following six aspects:

  • (1) Bionics theory research on the conceptual design of smart materials
  • (2) Research on the intrinsic characteristics of materials and the IQ evaluation system
  • (3) Application of dissipative structure theory to the research of smart materials
  • (4) Composite-integration principle and design theory of smart materials
  • (5) Nonlinear theory of smart structure integration
  • (6) Humanoid intelligent control theory

High-performance structural materials

Structural materials refer to engineering materials with mechanical properties as the main feature. They are the most widely used materials in the national economy. From daily necessities, buildings to automobiles, airplanes, satellites and rockets, they all obtain their shape, size and strength through some form of structural framework. Traditional materials such as steel and nonferrous metals belong to this category. High-performance structural materials generally refer to structural materials with higher mechanical properties such as strength, hardness, plasticity and toughness, and adapt to special environmental requirements. They include new metal materials, high-performance structural ceramic materials and polymer materials.

Current research hotspots include: high-temperature alloys, new aluminum alloys and magnesium alloys, high-temperature structural ceramic materials and polymer alloys.

New functional materials

Functional materials refer to materials that exhibit special properties such as electricity, magnetism, light, biology and chemistry in addition to mechanical properties. In addition to the information, energy, nano, biomedical and other materials introduced earlier, new functional materials mainly include high-temperature superconducting materials, magnetic materials, diamond films, functional polymer materials, etc.
Current research hotspots include: nano-functional materials, nanocrystalline rare earth permanent magnets and rare earth hydrogen storage alloy materials, bulk amorphous materials, high-temperature superconducting materials, magnetic shape memory alloy materials, magnetic polymer materials, diamond film preparation technology, etc.

New Chemical Materials

New chemical materials are basic raw materials used in the fields of chemical industry, petroleum, etc., mainly including organic fluorine materials, organic silicon materials, high-performance fibers, nano-chemical materials, inorganic functional materials, etc. Nano-chemical materials and special chemical coatings have been research hotspots in recent years.

Advanced ceramic materials

Advanced ceramic materials refer to products with excellent performance made from refined high-purity, ultra-fine inorganic compounds as raw materials and advanced preparation process technology. According to the requirements of engineering technology for product performance, the manufactured products can have piezoelectric, ferroelectric, conductive, semiconductor, magnetic, etc. or have excellent properties such as high strength, high toughness, high hardness, wear resistance, corrosion resistance, high temperature resistance, high thermal conductivity, insulation or good biocompatibility.

Advanced ceramic materials

Advanced ceramic materials

Advanced ceramic materials are generally divided into three categories: structural ceramics, ceramic-based composite materials and functional ceramics. Most functional ceramics are widely used in the electronics industry and are also commonly referred to as electronic ceramic materials. Such as ceramic insulating materials, ceramic substrate materials, ceramic packaging materials used to manufacture chips, and capacitor ceramics, piezoelectric ceramics, ferrite magnetic materials used to manufacture electronic devices.

Current research hotspots include the strengthening and toughening technology of ceramic materials, the preparation and synthesis technology of nano-ceramic materials, the design of advanced structural ceramic material systems, and the high uniformity and ultra-fine technology of electronic ceramic materials.

New building materials

New building materials mainly include new wall materials, chemical building materials, new thermal insulation materials, building decoration materials, etc. Among them, chemical building materials include building plastics, building coatings, building waterproofing, sealing materials, thermal insulation materials, sound insulation materials, special ceramics, building adhesives, etc., which are new building materials that my country will focus on developing during the “15th Five-Year Plan”.
New material definition: New materials refer to those materials that have emerged or are already developing and have excellent properties and special functions that traditional materials do not have. There is no clear boundary between new materials and traditional materials. New materials are developed on the basis of traditional materials. Traditional materials can be developed into new materials through improvements in composition, structure, design and process to improve material performance or have new properties.

Classification of new materials:

New materials are divided into four categories according to structural composition, including metal materials, inorganic non-metallic materials, organic polymer materials, and advanced composite materials. According to material performance, there are structural materials and functional materials. According to the uses and properties of new materials, the “China New Materials Products and Technology Guidance Catalogue” divides new materials products into more than ten specific technical fields, including new metal materials, new building materials, new chemical materials, electronic information materials, biomedical materials, new energy materials, nano and powder materials, new composite materials, new rare earth materials, high-performance ceramic materials, new carbon materials, new materials preparation technology and equipment.

1 Electronic information materials

  • (1) Microelectronic materials: wafers, packaging materials, photoresists, gold wires, pastes, electronic chemicals, IGBTs, power MOS
  • (2) Optoelectronic materials: optical rods, optical fibers, optical devices, optical disks, magnetic recording materials
  • (3) Flat panel display materials: polarizers, filters, glass, liquid crystals, PDP rare earth phosphors, OLED luminescent materials
  • (4) Solid-state laser materials: artificial crystals, nonlinear optical materials, special glass, coating materials

2 Energy-saving new materials

  • (1) Semiconductor lighting materials: substrates, epitaxial wafers, MO sources, high-purity gases, packaging materials
  • (2) Photovoltaic cell materials: polycrystalline silicon, single crystal silicon, thin films, glass
  • (3) New energy materials: fuel cell electrodes, solid oxides, secondary battery electrodes, membranes, lithium ion polymers, hydrogen storage alloy powders and other hydrogen storage materials

3 Nanomaterials
4 Advanced composite materials
Glass fiber, aramid, silicon carbide, graphite, boron fiber, steel fiber, whiskers, synthetic wear-resistant materials, resin-based, metal-based, ceramic-based composite materials, carbon/carbon composite materials, carbide blades , friction materials, composite materials
5 Advanced metal materials

  • (1) Super steel: new carbon, super alloy, complex phase, special steel, high temperature resistant, wear resistant and corrosion resistant materials, special materials, amorphous alloy (metal glass)
  • (2) Precious metals and nonferrous metals: high purity precious metals, aluminum magnesium titanium light alloys and materials, special copper materials

6 New chemical materials
Organic silicon, organic fluorine, engineering plastics and plastic alloys, special rubber, special fiber, special coating, refrigerant, fine chemical products
7 Advanced ceramic materials
Functional ceramics (microwave, ceramic dielectric electronic components , piezoelectric, sensitive, transparent) structural ceramics (honeycomb, wear-resistant, high temperature, high toughness, coating, ceramic-based composite)
8 Rare earth materials
High-purity rare earth, additives, catalysts, permanent magnets, luminescence, hydrogen storage
9 Magnetic materials
Soft magnetic materials, permanent magnets, magnetic recording materials, magnetic devices
10 Carbon materials
Activated carbon, carbon black, diamond, graphite, carbon fiber
11 Membrane materials
Filter membranes (organic membranes, inorganic membranes), functional films (optical, insulating)
12 Superconducting materials
Preparation and application technologies of practical superconducting wires, blocks, and films.
13 Biomedical materials
Implants, artificial tissues, blood filtration, sutures
14 Ecological and environmental materials
Environmental engineering materials, green packaging, degradable materials, environmental alternative materials
15 New building materials
Thermal insulation materials, high-strength cement, green ecological building materials

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