Method for preparing high-density silicon nitride ceramic through multi-factor optimization and prepared silicon nitride ceramic

A technology of silicon nitride ceramics and density, which is applied in the field of silicon nitride ceramics, can solve problems such as difficulty in obtaining high density, achieve high strength, excellent mechanical properties, and reduce pores

Inactive Publication Date: 2020-07-10
XIAN AOQIN NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing high-density silicon nitride ceramics through multi-factor optimization and the prepared silicon nitride ceramics, which solves the problem that existing silicon nitride ceramic products are difficult to obtain high-density (>99.5%) pieces The problem

Method used

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  • Method for preparing high-density silicon nitride ceramic through multi-factor optimization and prepared silicon nitride ceramic
  • Method for preparing high-density silicon nitride ceramic through multi-factor optimization and prepared silicon nitride ceramic
  • Method for preparing high-density silicon nitride ceramic through multi-factor optimization and prepared silicon nitride ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1, the mixing of the mixture

[0055] (1) Weigh the composite powder. In terms of mass percentage, the raw material of the composite powder includes 94% silicon nitride powder and 6% sintering aid. The sintering aid is a mixture of lutetium oxide, lanthanum oxide and aluminum oxide, and the mass ratio of lutetium oxide, lanthanum oxide and aluminum oxide is 2:1:1.

[0056] (2) Wet grinding and mixing. Using silicon nitride grinding balls as the ball milling medium, mix the weighed composite powder and alcohol into a planetary ball mill with a ball-to-battery ratio of 2:1, a rotating speed of 240r / min, and a milling time of 24h; before the ball milling, The dispersant sodium polyacrylate and the binder 2130 phenolic resin are added, and the dispersant and binder are respectively 2% and 2% of the total mass of the composite powder in terms of mass percentage.

[0057] Step 2, spray granulation and compaction of composite powder

[0058] (1) Spray and granulate the mixture...

Embodiment 2

[0063] Step 1, the mixing of the mixture

[0064] (1) Weigh the composite powder. In terms of mass percentage, the raw material of the composite powder includes 94% silicon nitride powder and 6% sintering aid. The sintering aid is a mixture of lutetium oxide, lanthanum oxide and aluminum oxide, and the mass ratio of lutetium oxide, lanthanum oxide and aluminum oxide is 2:1:1.

[0065] (2) Wet grinding and mixing. Using silicon nitride grinding balls as the ball milling medium, mix the weighed composite powder and alcohol into a planetary ball mill. The ball-to-battery ratio is 2:1, the speed is 240r / min, and the milling time is 24h; before the ball milling starts, The dispersant sodium polyacrylate and the binder 2130 phenolic resin are added, and the dispersant and binder are respectively 2% and 3% of the total mass of the composite powder in terms of mass percentage.

[0066] Step 2, spray granulation and compaction of composite powder

[0067] (1) Spray and granulate the mixture...

Embodiment 3

[0072] Step 1, the mixing of the mixture

[0073] (1) Weigh the composite powder. In terms of mass percentage, the raw material of the composite powder includes 94% silicon nitride powder and 6% sintering aid. The sintering aid is a mixture of lutetium oxide, lanthanum oxide and aluminum oxide, and the mass ratio of lutetium oxide, lanthanum oxide and aluminum oxide is 2:1:1.

[0074] (2) Wet grinding and mixing. Using silicon nitride grinding balls as the ball milling medium, mix the weighed composite powder and alcohol into a planetary ball mill. The ball-to-battery ratio is 2:1, the speed is 240r / min, and the milling time is 24h; before the ball milling starts, The dispersant sodium polyacrylate and the binder 2130 phenolic resin are added. In terms of mass percentage, the dispersant and binder are added in 2% and 5% of the total mass of the composite powder, respectively.

[0075] Step 2, spray granulation and compaction of composite powder

[0076] (1) Spray and granulate the ...

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Abstract

The invention provides a method for preparing high-density silicon nitride ceramic through multi-factor optimization and the prepared silicon nitride ceramic. According to the invention, by optimizingcold isostatic pressing molding, pre-sintering, hot isostatic pressing sintering process, composition, total content and other test parameters of a binder and a sintering aid, and adopting multi-factor optimization, the density of silicon nitride products is improved, the problem that the existing silicon nitride ceramic products are difficult to obtain parts with high density ( greater than 99.5%) is solved, and the produced silicon nitride product not only has high density ( greater than 99.5%), but also has extremely high strength. The excellent performances determine that the high-densitysilicon nitride ceramic can be more widely applied in the fields of aviation, aerospace, precise high-speed bearings, electronic packaging and the like

Description

Technical field [0001] The invention belongs to the technical field of silicon nitride ceramic products, and relates to a method for preparing high-density silicon nitride ceramics through multi-factor optimization and the prepared silicon nitride ceramics. Background technique [0002] The fracture toughness of silicon nitride ceramics can reach 7Mpa·m due to the self-toughening characteristics of β rod crystals 1 / 2 Above, the bending strength can reach more than 1000Mpa, which also makes silicon nitride ceramics become the most promising structural ceramics in the 21st century. However, the staggered structure of silicon nitride beta rod crystals also makes it difficult to increase its density, and it is also very easy to produce closed pores that are difficult to eliminate. [0003] At present, the main ways to improve the compactness of silicon nitride ceramics are to increase the content of sintering aids, hot press sintering, SPS sintering or increasing the nitrogen pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/64C04B35/645C04B35/634
CPCC04B35/584C04B35/622C04B35/63476C04B35/64C04B35/6455C04B2235/3217C04B2235/3224C04B2235/3227C04B2235/6562C04B2235/661C04B2235/96
Inventor 管晶李世佳管甲锁宋索成
Owner XIAN AOQIN NEW MATERIAL CO LTD
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