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Silicon nitride ceramic part and manufacturing method thereof

A technology of silicon nitride ceramics and a manufacturing method, applied in the field of ceramic materials, can solve the problems of limited density of parts, unacceptable for enterprises, and high cost of raw materials, and achieve the effects of improving efficiency, increasing density and reducing production costs

Pending Publication Date: 2021-10-29
淄博国创中心先进车用材料技术创新中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] CN104628393B patent discloses a preparation method of high-performance ceramics, including ceramic parts biscuit, deglue treatment, cold isostatic pressing treatment, pre-sintering treatment, hot isostatic pressing package making synchronous powder feeding laser cladding treatment, heat treatment, etc. The preparation steps of static pressure sintering and polished rice processing use high-purity silicon nitride powder as raw material, no need for vacuuming, packaging, short cycle, high efficiency, low cost, high strength and good performance, but the density of the parts is limited restricted
[0008] The second inventor of the above two published patents, as the inventor of this application, found that the high-purity silicon nitride powder on the market ranges from several hundred to several thousand per kilogram, while ordinary industrial silicon nitride powder The price of powder is much lower. The high cost of these raw materials is unacceptable to enterprises and difficult to promote in the market. Therefore, it is urgent to change this status quo

Method used

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  • Silicon nitride ceramic part and manufacturing method thereof
  • Silicon nitride ceramic part and manufacturing method thereof
  • Silicon nitride ceramic part and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A silicon nitride (Si 3 N 4 ) A method for manufacturing a ceramic negative spherical part, comprising the following steps:

[0057] (a) 80g of industrial silicon powder with a purity of 99.5% or more and a powder particle size of 5-25μm, and 20g of α-Si with a median particle size of 10±0.5μm 3 N 4 Mix evenly by ball milling, then add 10g of bisphenol A epoxy resin with a particle size of 20-50μm, 1g of magnesia, and 2.5g of zirconia, use the 3D modeling design software catia to design the 3D digital model of the ceramic negative spherical part, and divide it with slices Layer software converts it into STL format and imports it into SLS equipment, and the laser is 60W CO 2 Laser, the preheating temperature is 40°C, the thickness of the single layer is 0.1mm, the scanning distance is 0.1mm, the scanning speed is 1000mm / s, and the relative density of the blank of the part is 30-35%;

[0058] (b) Carry out the first vacuum pressure infiltration impregnation on the gre...

Embodiment 2

[0067] A silicon nitride (Si 3 N 4 ) A method for manufacturing a ceramic negative spherical part, comprising the following steps:

[0068] (a) 50g of industrial silicon powder with a purity of 99.5% or more and a powder particle size of 10-25μm, and 50g of α-Si with a median particle size of 10±0.5μm 3 N 4 Mix evenly by ball milling, then add 15g of bisphenol A epoxy resin with a particle size of 20-50μm, 2g of magnesium oxide, and 3g of zirconia, use the three-dimensional modeling design software pro / E to design the three-dimensional digital model of the ceramic negative spherical part, and slice it The layering software converts it into STL format and imports it into SLS equipment, and the laser is 35W CO 2 Laser, the preheating temperature is 60°C, the thickness of the single layer is 0.2mm, the scanning distance is 0.2mm, the scanning speed is 3000mm / s, and the relative density of the blank of the part is 30-35%;

[0069] (b) Carry out the first vacuum pressure infilt...

Embodiment 3

[0078] A silicon nitride (Si 3 N 4 ) A method for manufacturing a ceramic negative spherical part, comprising the following steps:

[0079] (a) 60g of industrial silicon powder with a purity of 99.5% or more and a powder particle size of 10-25μm, and 40g of α-Si with a median particle size of 10±0.5μm 3 N 4 Mix evenly by ball milling, then add 20g of bisphenol A epoxy resin with a particle size of 20-50μm and 4g of carbon powder, use the 3D modeling design software Solidworks to design the 3D digital model of the ceramic negative spherical part, and use the slice layering software to transfer it Import SLS equipment for STL format, the laser is 50W CO 2 Laser, the preheating temperature is 50°C, the thickness of the single layer is 0.1mm, the scanning distance is 0.1mm, the scanning speed is 3000mm / s, and the relative density of the blank of the part is 30-35%;

[0080] (b) Carry out the first vacuum pressure infiltration impregnation on the green body of the part, put the...

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Abstract

The invention relates to the field of ceramic materials, in particular to a silicon nitride ceramic part and a manufacturing method thereof. The silicon nitride ceramic part is prepared from the following raw materials in percentage by mass: 50-80% of silicon powder, 20-50% of alpha-Si3N4, a binder accounting for 5-30% of the total mass of the silicon powder and alpha-Si3N4, and a sintering aid accounting for 0.5-5% of the total mass of the silicon powder and alpha-Si3N4, the silicon powder is industrial silicon powder, the purity is 99.5% or above, and the particle size of the powder is 5-70 microns; and the median particle size of the alpha-Si3N4 is 10 + / -0.5 [mu] m. The silicon nitride ceramic part provided by the invention not only can maintain the performance advantages of high strength, high bending resistance and high hardness of silicon nitride ceramic, but also can reduce the production cost and achieve the purpose of market promotion. The invention also provides a preparation method of thesilicon nitride ceramic part.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a silicon nitride ceramic part and a manufacturing method thereof. Background technique [0002] Si 3 N 4 Ceramic is an important structural material with high hardness, good lubricity, and strong wear resistance. Therefore, it has become an important material for the manufacture of ball bearings, gas turbine blades, mechanical seal rings, permanent molds and other components. [0003] The earliest silicon powder nitriding method to synthesize Si 3 N 4 The powder method has low cost and can be produced on a large scale, but the product has a large particle size. Put the silicon powder with high purity in the reaction furnace to pass nitrogen or ammonia gas, and heat it to 1200-1400 ° C for nitriding reaction to obtain Si. 3 N 4 powder, but the original silicon nitride parts prepared from low-cost silicon powder have low strength, toughness and corrosion resistance, and it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/64
CPCC04B35/584C04B35/64C04B2235/3878C04B2235/428C04B2235/46C04B2235/5436C04B35/63452C04B2235/6562C04B2235/6567C04B2235/665
Inventor 曹冲张振翀马金秋
Owner 淄博国创中心先进车用材料技术创新中心
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