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Silicon nitride ceramic and preparation method thereof

A technology of silicon nitride ceramics and tetramethylammonium hydroxide, which is applied in the field of silicon nitride ceramics and its preparation, can solve the problems of excessively high requirements for silicon nitride raw materials, affecting high-temperature performance of materials, and extremely high chemical activity requirements, and achieves Low production cost, lower sintering temperature, uniform color effect

Inactive Publication Date: 2018-04-06
上海骏宇陶塑制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production cost is very expensive, and the alpha crystal content (chemical activity) of the raw material is extremely demanding
Later, the materials industry introduced two kinds of rare earth additives (Y 2 o 3 and La 2 o 3 ), although the sintering temperature (1900 degrees Celsius) is reduced, there are still too high requirements for silicon nitride raw materials, and the high liquid phase content affects the high temperature performance of the material

Method used

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  • Silicon nitride ceramic and preparation method thereof
  • Silicon nitride ceramic and preparation method thereof
  • Silicon nitride ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of composite granulated powder: weigh each component according to mass percentage, where the composite mixed powder includes Al 2 O 3 : 6%, Y 2 O 3 : 0.8%, CeO 2 : 0.3%, Sm 2 O 3 : 0.4%, Si 3 N 4 Ceramic powder: 92.5%, then add crystalline tetramethylammonium hydroxide and PVB ethanol solution, the mass of tetramethylammonium hydroxide is 0.8% of the composite mixed powder, the mass of PVB ethanol solution and the composite mixed powder The ratio is 0.8-1, and the mass concentration of PVB in the ethanol solution of PVB is 1%-2%. Load the above components into a stirring ball mill using ethanol as the ball milling medium for ball milling, ball milling for 18-20 hours, spray granulating the powder after ball milling, vacuum degree -0.2MPa, drying temperature 100°C, time 2 hour;

[0021] (2) Preliminary preparation of blank: The composite granulated powder is pressed into a shape under a 100T hydraulic press, and pressed at a pressure of 1T per square centime...

Embodiment 2

[0026] (1) Preparation of composite granulated powder: weigh each component according to mass percentage, where the composite mixed powder includes Al 2 O 3 : 4%, Y 2 O 3 : 1.1%, CeO 2 : 0.5%, Sm 2 O 3 : 0.5%, Si 3 N 4 Ceramic powder: 93.9%, then add the ethanol solution of crystalline tetramethylammonium hydroxide and PVB, the mass of tetramethylammonium hydroxide is 0.9% of the composite mixed powder, the mass of the ethanol solution of PVB and the composite mixed powder The ratio is 0.9:1, and the mass concentration of PVB in the ethanol solution of PVB is 1%-2%. Load the above components into a stirring ball mill using ethanol as the ball milling medium for ball milling, ball milling for 18-20 hours, spray granulating the powder after ball milling, vacuum degree -0.1MPa, drying temperature 120°C, time 2 hour;

[0027] (2) Preliminary preparation of blank: The composite granulated powder is pressed into a shape under a 100T hydraulic press, and pressed at a pressure of 1T per ...

Embodiment 3

[0032] (1) Preparation of composite granulated powder: weigh each component according to mass percentage, where the composite mixed powder includes Al 2 O 3 : 5%, Y 2 O 3 : 0.9%, CeO 2 : 0.4%, Sm 2 O 3 : 0.5%, Si 3 N 4 Ceramic powder: 93.2%, then add crystalline tetramethylammonium hydroxide and PVB ethanol solution, the mass of tetramethylammonium hydroxide is 1.0% of the composite mixed powder, the mass of PVB ethanol solution and the composite mixed powder The ratio is 0.8:1, and the mass concentration of PVB in the ethanol solution of PVB is 1%-2%. Load the above components into a stirring ball mill using ethanol as the ball milling medium for ball milling, ball milling for 18-20 hours, spray granulating the powder after ball milling, vacuum degree -0.1MPa, drying temperature 110°C, time 4 hour;

[0033] (2) Preliminary preparation of blank: The composite granulated powder is pressed into a shape under a 100T hydraulic press, and pressed at a pressure of 1T per square centime...

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Abstract

The invention discloses silicon nitride ceramic and a preparation method thereof. By adopting the preparation method different from traditional formulas, three different kinds of rare earth raw materials are added to successfully sinter a compact silicon nitride material with density close to a theoretic value, and on the basis of the material, not only is the sintering temperature reduced, but also the physical performance of the product is improved. The raw materials include 4-7% of Al2O3, 0.8-1% of Y2O3, 0.3-0.5% of CeO2, 0.4-0.5% of Sm2O3 and 91-94% of Si3N4 ceramic powder. The invention further provides a method for adopting the formula to prepare silicon nitride products. The products prepared by means of the method can be used for a long time under an environment at 750-900 DEG C.

Description

Technical field [0001] The invention relates to a silicon nitride ceramic and a preparation method thereof, and belongs to the field of preparation of inorganic non-metallic materials. Background technique [0002] Silicon nitride ceramics is a kind of covalent bond compound, itself is a kind of extremely difficult to sinter material, according to the traditional process (add Y 2 O 3 A rare earth raw material) can be sintered at a high temperature close to 2000 degrees Celsius and a pressure of 10 MPa. The production cost is very expensive, and the alpha crystal content (chemical activity) of the raw materials is extremely high. Later, the material industry introduced two rare earth additives (Y 2 O 3 And La 2 O 3 After ), although the sintering temperature is lowered (1900 degrees Celsius), there are still too high requirements for silicon nitride raw materials, and the high liquid phase content affects the high temperature performance of the material. Summary of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622
CPCC04B35/584C04B35/622C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/6562C04B2235/6567C04B2235/6581
Inventor 周宇
Owner 上海骏宇陶塑制品有限公司
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