AlON ceramic composite material and preparation method thereof

A ceramic composite material and composite material technology, applied in the field of AlON ceramic composite material and its preparation, can solve the problems of affecting performance and service life, restricting wide application, poor high temperature oxidation resistance, etc.

Inactive Publication Date: 2021-08-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although AlON materials have good mechanical properties, the high-temperature oxidation resistance of AlON ceramic materials is relatively poor, which seriously affects the performance and service life of the material at higher temperatures, and restricts the wide application of the material in industry. Therefore, it is necessary to develop an AlON composite material to improve the high temperature oxidation resistance of the material

Method used

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  • AlON ceramic composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 88wt.% AlON powder and 12wt.% SiC powder were selected as raw materials, and the target product was prepared by vacuum hot pressing sintering method. The sintering temperature was 1800°C, the sintering holding time was 45min, the applied pressure was 25MPa, and the protective gas was N 2 . Cut the prepared composite ceramic product into 25mm×6mm×6mm long strip samples with a diamond inner circle cutting machine, and carry out grinding and polishing treatment on them, then raise the muffle furnace to 1500°C, and then cut the strips Put the sample into the furnace and oxidize it in the air for 40 hours, and the oxidation weight gain rate is measured to be 2.568%. The bending strength of the sample is measured by three-point bending loading. The span is selected as 20mm, and the loading rate is 0.2mm / min, the measured bending strength is 324MPa; the fracture toughness of the sample is measured by indentation method, the indenter is Vickers indenter, and the measured fractu...

Embodiment 2

[0037] Select 88wt.% AlON powder, 12wt.% SiC powder and B 4 C powder is used as raw material (the mass fraction of SiC powder is 1%, and the rest is B 4 C powder), the target product was prepared by vacuum hot pressing sintering method, the sintering temperature was 1850°C, the sintering holding time was 30min, the applied pressure was 28MPa, and the protective gas was N 2 . Cut the prepared composite ceramic product into 25mm×6mm×6mm long strip samples with a diamond inner circle cutting machine, and carry out grinding and polishing treatment on them, then raise the muffle furnace to 1500°C, and then cut the strips Put the sample into the furnace and oxidize it in the air for 40 hours, and the oxidation weight gain rate is measured to be 2.881%. The bending strength of the sample is measured by three-point bending loading. The span is selected as 20mm, and the loading rate is 0.2mm / min, the measured bending strength is 301MPa; the fracture toughness of the sample is measure...

Embodiment 3

[0039] Select 88wt.% AlON powder, 12wt.% SiC powder and B 4 C powder is used as raw material (the mass fraction of SiC powder is 3%, and the rest is B 4 C powder), the target product was prepared by vacuum hot pressing sintering method, the sintering temperature was 1850°C, the sintering holding time was 35min, the applied pressure was 25MPa, and the protective gas was N 2. Cut the prepared composite ceramic product into 25mm×6mm×6mm long strip samples with a diamond inner circle cutting machine, and carry out grinding and polishing treatment on them, then raise the muffle furnace to 1500°C, and then cut the strips Put the sample into the furnace and oxidize it in the air for 40 hours, and the measured oxidation weight gain rate is 2.725%. The bending strength of the sample is measured by three-point bending loading, where the span is selected as 20mm, and the loading rate is 0.2mm / min, the measured bending strength is 311MPa; the fracture toughness of the sample is measured...

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Abstract

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to an AlON ceramic composite material and a preparation method thereof. According to the invention, AlON, SiC and B4C powder are used as raw materials, and the AlON composite ceramic material is prepared by a hot pressed sintering method by adjusting the mass ratio of SiC to B4C. After the obtained product is statically oxidized for 40 hours in air at 1500 DEG C, the oxidation weight gain rate is reduced by 78.8%-85.7% compared with that of pure AlON ceramic, the bending strength at room temperature is 301-324 MPa, the fracture toughness is 1.40-1.51 MPa.m<1/2>, the oxidation resistance of the AlON material is greatly improved, and a reference is provided for further application of the AlON ceramic in the high-temperature field.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to an AlON ceramic composite material and a preparation method thereof. Background technique [0002] AlON ceramic material has good mechanical properties, oxidation resistance and thermal shock resistance at high temperatures, and has a small expansion coefficient, high chemical stability, and strong corrosion resistance. It has become a very potential high-temperature structural ceramics and high-quality refractory materials. . [0003] In order to enhance the performance of AlON materials, the prior art discloses a variety of AlON composite materials, such as the layered aluminum oxynitride ceramic composite material in the patent CN108218437B, one layer of aluminum oxynitride (AlON) ceramic layer and two layers of AlON composite ceramic layer, The AlON ceramic layer is located between two layers of AlON composite ceramic layers; the AlON cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581
CPCC04B35/581C04B2235/3826C04B2235/3821C04B2235/3418C04B2235/3409C04B2235/96
Inventor 赵小军钟琦肖来荣肖宇翔陈律铭
Owner CENT SOUTH UNIV
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