First, powder materials are the key to 3D printing ceramic technology

Additive manufacturing (3D printing) is known as the third industrial revolution. For ceramic materials, the properties of raw material powders (such as purity, particle size and distribution, particle morphology, etc.) have a direct impact on the performance of ceramics. . Ideally, the components are characterized by fine control, high density, good sphericity, small particle size, narrow particle size distribution, good dispersibility and good fluidity.

Second, 5 large ceramic powder
1, alumina powder
(1) Characteristics of alumina powder
Alumina is a white amorphous powder with extremely hard material, high melting point, acid and alkali resistance, corrosion resistance and good insulation. It is mainly used for the smelting of aluminum and also for refractory materials and ceramics.
99.99% high purity alumina powder is mainly used in high pressure sodium lamps, new luminescent materials, special ceramics, advanced coatings, trichromatic colors, catalysts and some high performance materials. 99.995% high-purity alumina powder is mainly used in LED artificial sapphire crystals, advanced ceramics, PDP phosphors and some high-performance materials.
The alumina nanopowder is added to an aqueous liquid of various resins such as an acrylic resin, a urethane resin, or a silicone-acrylic emulsion, and the addition amount is 5% to 10%, which can increase the hardness of the resin.

(2) Preparation method of alumina powder
Chemical preparation methods: Bayer method, ammonium aluminum sulfate pyrolysis method, ammonium aluminum carbonate pyrolysis method, Bayer process alumina powder average particle size range of 10-100μm, high alkali content, coarse particle size, not suitable for use in fine ceramics;
Mechanical grinding: Alumina is milled to a sub-micron size or nano-particle size under the grinding of high-energy grinding equipment. The alumina powder prepared by this method has many surface defects, good sintering activity, and low cost. Convenient, high yield and other advantages.

(3) Alumina ceramics

Alumina ceramics have good conductivity, mechanical strength and high temperature resistance.

2, zirconia powder

(1) Characteristics of zirconia powder
As a metal oxide, zirconia has excellent physical and chemical properties such as high melting point, large coefficient of thermal expansion, strong corrosion resistance and good chemical stability. It can be applied to porcelain teeth, knives, sensors, bearings, ceramics, etc. Automotive exhaust gas exhaust and other fields.
(2) Preparation method of zirconia powder
The preparation method of zirconia powder includes mechanical pulverization, chemical precipitation method, hydrothermal method, hydrothermal crystallization, sol-gel method, plasma method, electric arc furnace method, spray drying, etc., and industrially, pulverized zirconia powder is prepared by jet milling. The particle size is generally between 1-88 um.
(3) Zirconia ceramics

Zirconia ceramics have excellent melting point and boiling point, high hardness, insulator at normal temperature, and electrical conductivity at high temperatures. They can be used as induction heating tubes, heating elements, oxygen sensors, high temperature heating elements, thermal barrier coatings, etc. .

3, silicon carbide powder
(1) Characteristics of silicon carbide powder
Silicon carbide is a super-hard material with a Mohs hardness of 9.5, which has excellent properties such as high hardness, high strength, good oxidation resistance and wear resistance. There are four main applications for silicon carbide: functional ceramics, advanced refractories, abrasives and metallurgical materials.
(2) Preparation method of silicon carbide powder
The industrial production method of silicon carbide is refined in a resistance furnace using high-quality quartz sand and petroleum coke. The obtained silicon carbide block is made into various particle size products by crushing, acid-base washing, magnetic separation, screening or water selection.
Silicon carbide itself has a high hardness, and its particle size distribution must reach a limited range. It is very difficult for the pulverization and classification of silicon carbide micropowder. The airflow pulverization and classification equipment is an irreplaceable ultra-fine processing equipment for the silicon carbide micropowder industry.

(3) Silicon carbide ceramics
Silicon carbide ceramics have excellent mechanical properties at room temperature (high bending strength, excellent oxidation resistance, good corrosion resistance, high abrasion resistance and low coefficient of friction), and high temperature mechanical properties (strength, creep resistance) Etc.) is the best among known ceramic materials.

4, aluminum nitride powder
(1) Characteristics of aluminum nitride
Aluminum nitride-based diamond-like nitride, which is white or grayish white, has high thermal conductivity (about 3200 W/m·K), small thermal expansion coefficient, excellent electrical properties, good mechanical properties, good optical transmission characteristics, etc., and is good. Thermal shock resistant materials for use in tantalum materials, electrical insulators, high power integrated circuit substrates and packaging materials.
(2) Preparation of aluminum nitride powder
Common preparation methods of aluminum nitride powder include: aluminum powder direct nitriding method, alumina powder carbothermal reduction method, self-propagating high-temperature synthesis method, chemical vapor deposition method, sol-gel method, plasma method, etc., among which aluminum powder The direct nitridation method and the alumina powder carbothermal reduction method have been applied to large-scale production in the market. The self-propagating high-temperature synthesis method has been studied in small batches with the in-depth study of its mechanism.

At present, high-quality aluminum nitride powder products (such as Deshan Company of Japan) are prepared by plasma method, but the method is expensive and complicated in technology, and is in the monopoly field of a few developed countries and companies.
(3) Aluminum nitride ceramics

The aluminum nitride ceramic substrate has high thermal conductivity, low expansion coefficient, chemical resistance, high resistivity and low dielectric loss, and is an ideal large-scale integrated circuit heat sink substrate and packaging material. Aluminum nitride ceramics have good metallization properties and can be used in the electronics industry instead of toxic enamels.

5, silicon nitride powder
(1) Characteristics of silicon nitride powder
Silicon nitride powder is gray, white or grayish white, and has high hardness, wear resistance, corrosion resistance, small expansion coefficient, high thermal conductivity and high temperature oxidation resistance. It is an important structural ceramic material. Silicon nitride powder can be used in the fields of refractory materials, bearing balls, ball valve corrosion resistant parts, functional ceramics, and the like.
(2) Preparation method of silicon nitride powder
The preparation method of the silicon nitride powder mainly includes a direct nitridation method, a carbothermal reduction method, a silicon germanium imide decomposition method, and the like. Among them, the direct nitriding method has been widely recognized and adopted by the scientific community and the industry because of its simple and easy production process, easy operation of production equipment and low production cost.
(3) Silicon nitride ceramics
Silicon nitride ceramics are lightweight and rigid, making them an ideal high-temperature structural material for ball bearings, diesel engine glow plugs, and more.