Nitride ceramic material microwave sintering method

A nitride ceramic and microwave sintering technology, applied in the field of preparation of inorganic non-metallic nitride ceramic materials, can solve the problems of difficulty in production and application of aluminum nitride ceramic materials, long holding time, low production efficiency, etc. The effect of reaction sintering process, short holding time and high production efficiency

Inactive Publication Date: 2013-07-31
HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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Problems solved by technology

[0003] However, since most nitride ceramic materials are solid-phase sintered, although additives can be used for liquid-phase sintering, the sintering temperature is still high, and the holding time still needs a long time, which is difficult to sinter, high energy consumption, and extremely high production efficiency. Low, such as the sintering of aluminum nitride ceramic materials, add 5% Y 2 o 3 Sintering aids, the traditional sintering method requires a sintering temperature of 1900°C and a 24-hour heat preservation to obtain a finished product of aluminum nitride ceramic material with good performance, which brings great difficulties to the production and application of aluminum nitride ceramic material

Method used

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  • Nitride ceramic material microwave sintering method

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Embodiment 1

[0014] Combine Japanese Deshan H-grade aluminum nitride powder with 5% high-purity Y 2 o 3 The powder is mixed and pressed into a billet with a size of φ50×10mm, such as figure 1 Shown inside a sagger. The sagger was placed in the sintering chamber of an intermittent industrial microwave oven for microwave sintering, and the microwave frequency was 2.45 GHz. Introduce high-purity nitrogen protection, the pressure is normal pressure, the sintering temperature is 1720 ° C, and the temperature is kept for 2 hours. After cooling, the obtained sintered body is the finished aluminum nitride ceramic material. It has been determined that the thermal conductivity of the prepared aluminum nitride ceramic material is 154W / m·k, and the density is 3.20g / cm 3 , do XRD analysis phase structure is AlN, YAlO 3 .

Embodiment 2

[0016] Mix silicon nitride with a mass percentage of 58% and an appropriate amount of TiC, ZrN, AlN, etc. to make a Ф10mm ball, such as figure 1 Shown inside a sagger. The sagger was placed in the sintering chamber of a continuous industrial microwave oven for microwave sintering, and the microwave frequency was 2.45 GHz. Introduce high-purity nitrogen protection, the pressure is normal pressure, the sintering temperature is 1700 ° C, and the temperature is kept for 2 hours. After cooling, the obtained sintered body is the finished silicon nitride composite ceramic material. After measurement, the density of the finished silicon nitride composite ceramic material is 3.71g / cm 3 , hardness 1520HV.

Embodiment 3

[0018] Combine Japanese Deshan H-grade aluminum nitride powder with 4% high-purity Y 2 o 3 The powder is mixed and pressed into a billet with a size of 50mm×50mm×10mm, such as figure 1 Shown inside a sagger. The sagger was placed in the sintering chamber of an intermittent industrial microwave oven for microwave sintering, and the microwave frequency was 2.45 GHz. The mixed gas protection of nitrogen and hydrogen is introduced, the pressure is normal pressure, the sintering temperature is 1650°C, and the temperature is kept for 10 hours. After cooling, the obtained sintered body is the finished aluminum nitride ceramic material. It has been determined that the thermal conductivity of the prepared aluminum nitride ceramic material is 148W / m·k, and the density is 3.19g / cm 3 , do XRD analysis phase structure is AlN, YAlO 3 .

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Abstract

The invention discloses a nitride ceramic material microwave sintering method. According to the invention, a nitride ceramic blank is placed between graphite plates, and microwave sintering is carried out under a protective atmosphere in a microwave sintering device. A microwave frequency value range is 2.45GHz, a microwave sintering temperature is 500-3000 DEG C, and a temperature maintaining time is 0-50h. The protective atmosphere is composed of nitrogen gas or argon gas or a mixed gas of nitrogen and hydrogen. The pressure is normal pressure. Different from traditional convection, conduction or radiation heating method, according to the invention, heat is produced through the coupling of a special band of microwave and the basic structure of the material. With the medium loss of the material, the material is heated with an integral heating manner. The method has the advantages of low sintering temperature, short temperature maintaining time, low energy consumption, and the like. The sintered material has good performances and considerable economic benefit.

Description

technical field [0001] The invention relates to a preparation method of an inorganic non-metallic nitride ceramic material, in particular to a method for microwave sintering of a nitride ceramic material. Background technique [0002] Nitride ceramic materials are a new class of ceramic materials with a wide range of uses, including aluminum nitride ceramics, silicon nitride ceramics, boron nitride ceramics, etc., and there are countless composite materials. Because of its important position in the field of materials, Therefore, it has been paid more and more attention by material researchers and users. [0003] However, since most nitride ceramic materials are solid-phase sintered, although additives can be used for liquid-phase sintering, the sintering temperature is still high, and the holding time still needs a long time, which is difficult to sinter, high energy consumption, and extremely high production efficiency. Low, such as the sintering of aluminum nitride cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/58
Inventor 曾小锋徐助要李勇全
Owner HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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