Aluminum Nitride Ceramic Parts

Aluminum Nitride Ceramic is a ceramic with aluminum nitride (AIN) as the main crystal phase.

Zhongwei Precision is committed to providing domestic and foreign customers with advanced aluminum nitride ceramic parts with high strength, high toughness, wear resistance, corrosion resistance and high temperature resistance,technology companies. With a variety of modern high-precision equipment, it has independently realized the completion of the entire production process of ceramic parts from ceramic powder preparation, green body molding, high temperature sintering to ceramic material finishing.

Product Description

1. Implementation standards: the company strictly implements ISO9001 certification, and the products have passed ROHS, FDA EU certification, etc.

2. Product material standards: ISO, GB, ASTM, SAE, EN, DIN, BS, AMS, JIS, ASME, DMS, TOCT, GB

3. Main processes: grouting, injection molding, tape casting, isostatic pressing, 3D printing

4. Available materials for ceramics:

It mainly produces finished ceramic rods, ceramic tubes, ceramic rings, ceramic plates, ceramic suction cups, ceramic blades and other special-shaped ceramic structures. The main ceramic materials are alumina, zirconia, silicon carbide, silicon nitride, and aluminum nitride ceramics. High temperature resistance, wear resistance, corrosion resistance, acid and alkali resistance, anti-magnetic, pressure resistance. And 3D printing, etc. are customized according to customer requirements.

Combined tube, its high wear resistance effectively resists material wear and impact.

Product Structure

AIN crystal is a covalent bond compound with [AIN4] tetrahedron as the structural unit, has a wurtzite structure, and belongs to the hexagonal crystal system. Chemical composition AI 65.81%, N 34.19%, specific gravity 3.261g/cm3, white or off-white, single crystal is colorless and transparent, the sublimation decomposition temperature under normal pressure is 2450℃. It is a high temperature heat resistant material. Thermal expansion coefficient (4.0-6.0) X10-6/℃. The thermal conductivity of polycrystalline AIN is 260W/(m.k), which is 5-8 times higher than that of alumina, so it has good thermal shock resistance and can withstand extreme heat of 2200℃. In addition, aluminum nitride has the property of not being attacked by molten aluminum and other molten metals and gallium arsenide, and especially has excellent corrosion resistance to molten aluminum.

Performance index of aluminum nitride ceramic parts

(1) High thermal conductivity (about 320W/m·K), close to BeO and SiC, and more than 5 times that of Al2O3;

(2) The thermal expansion coefficient (4.5×10-6°C) matches Si (3.5-4×10-6°C) and GaAs (6×10-6°C);

(3) Excellent electrical properties (dielectric constant, dielectric loss, volume resistivity, dielectric strength);

(4) Good mechanical properties, the flexural strength is higher than that of Al2O3 and BeO ceramics, and it can be sintered at normal pressure;

(5) Good optical transmission characteristics;

(6) Non-toxic.

Application

1. Aluminum nitride powder has high purity, small particle size and high activity. It is the main raw material for manufacturing high thermal conductivity aluminum nitride ceramic substrates.

2. Aluminium ceramic nitride parts substrates have high thermal conductivity, low expansion coefficient, high strength, high temperature resistance, chemical corrosion resistance, high resistivity, and low dielectric loss. They are ideal large-scale integrated circuit heat dissipation substrates and packaging materials.

3. Aluminum nitride has high hardness, surpassing traditional alumina, and is a new type of wear-resistant ceramic material, but due to its high cost, it can only be used for parts with severe wear.

4. Using AIN ceramics with heat resistance, melt erosion resistance and thermal shock resistance, GaAs crystal crucibles, Al evaporating dishes, magnetic fluid power generation devices and high temperature turbine corrosion-resistant parts can be made, and their optical properties can be used as infrared windows. Aluminum nitride films can be made into high frequency piezoelectric components, VLSI substrates, etc.

5. Aluminum nitride is heat-resistant and resistant to erosion of molten metal, stable to acid, but easily eroded in alkaline solution. The nascent surface of AIN will react to form a very thin oxide film when exposed to humid air. Taking advantage of this characteristic, it can be used as crucible and casting mold material for smelting aluminum, copper, silver, lead and other metals. AIN ceramics have good metallization properties and can replace toxic beryllium oxide ceramics and are widely used in the electronics industry.

Process After Sintering

Processing equipment: equipped with CNC engraving machine, centerless grinding, internal and external cylindrical grinding, surface grinding, CNC lathe machining center, wire cutting, turning, milling, grinding and other high-precision production and testing equipment.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam).

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements.

3. Test equipment: roundness measuring instrument, three-coordinate measuring instrument, image coordinate measuring instrument, Hexagon three-coordinate measuring instrument, image measuring instrument, density measuring instrument, smoothness measuring instrument, micro Vickers hardness tester.

Outlook

Because of its excellent thermal, electrical and mechanical properties. Aluminum nitride ceramics have attracted extensive attention from researchers at home and abroad. With the rapid development of modern science and technology, higher requirements have been placed on the properties of the materials used. Aluminum nitride ceramics will also be more widely used in many fields! Despite the unremitting efforts of many researchers over the years, great progress has been made in the research on powder preparation, forming, and sintering. However, as of April 2013, the commercialization of aluminum nitride is not high, which is also a key factor affecting the further development of aluminum nitride ceramics. In order to promote the further development of aluminum nitride research and application, the following two research work must be done. Research low-cost powder preparation processes and methods! The main factor restricting the commercialization of aluminum nitride is the price issue. If aluminum nitride powder can be prepared at a lower cost, its commercialization degree will be greatly improved! High-temperature self-propagating method and low-temperature carbothermic reduction synthesis process are promising powder synthesis methods. The two have the characteristics of low cost and suitable for large-scale production! Research the net near forming technology of complex shape aluminum nitride ceramic parts such as injection molding technology. Aluminum nitride ceramic parts are of great significance to give full play to the performance advantages of aluminum nitride and to broaden its application range!