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Transparent beta-silicon nitride ceramics and preparation method thereof

A silicon nitride ceramic and transparent technology, which is applied in the field of transparent β-silicon nitride ceramics and its preparation, can solve the problems of reduced light transmittance, difficulty in preparing transparent β-silicon nitride ceramics, etc., and achieve good thermal shock resistance , excellent mechanical properties, high thermal conductivity

Inactive Publication Date: 2010-06-09
烟台同立高科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in the refractive index between the grain boundary phase and the grain itself, a large amount of refraction and scattering of light is caused, which greatly reduces the light transmittance and makes the long rod-shaped β-Si 3 N 4 The preparation of transparent β-silicon nitride ceramics composed of crystal grains is very difficult
So far about the single β-Si 3 N 4 The research work of transparent ceramics with phase composition is rarely reported

Method used

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  • Transparent beta-silicon nitride ceramics and preparation method thereof
  • Transparent beta-silicon nitride ceramics and preparation method thereof
  • Transparent beta-silicon nitride ceramics and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] to Si 3 N 4 powder and MgSiN 2 Powder is the raw material, and the weight ratio of the two is 100:4. After the raw materials are evenly mixed, they are firstly dry-pressed and then put into a graphite mold. The sintering time is 50 hours; after the sintering, the sample is cooled to room temperature with the furnace, and a transparent β-silicon nitride ceramic is obtained.

[0017] figure 1 The physical photos of the transparent β-silicon nitride ceramics with an unpolished surface and a thickness of about 1 mm obtained in this example are given; as identified by XRD, the transparent ceramics prepared by the above process have a single crystal phase of β-Si 3 N 4 phase; microstructural analysis of this sample showed that it was composed of long rod-shaped grains, such as figure 2 shown.

Embodiment 2

[0019] to Si 3 N 4 Powder, MgSiN 2 Powder and Y 2 o 3 Powder is the raw material, and its weight ratio is 100:6.7:0.5. After the raw materials are evenly mixed, they are put into graphite molds, and the mechanical pressure is 60MPa, the nitrogen pressure is 2.0MPa, the temperature is 2100°C, and the holding time is 30 hours. After sintering, the sample was cooled to room temperature with the furnace to obtain transparent β-silicon nitride ceramics.

Embodiment 3

[0021] to Si 3 N 4 Powder, MgSiN 2 powder, CaO powder and Y 2 o 3 Powder is the raw material, and its weight ratio is 100:1.9:0.2:0.1. After the raw materials are evenly mixed, they are put into graphite molds, and the mechanical pressure is 70MPa, the nitrogen pressure is 4.5MPa, the temperature is 2250°C, and the holding time is 25 hours. After sintering, the sample was cooled to room temperature with the furnace to obtain transparent β-silicon nitride ceramics.

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Abstract

Disclosed are transparent beta-silicon nitride ceramics and a process for preparation thereof, which belong to the field of non-oxidized substances. The transparent beta-silicon nitride ceramics of the invention utilizes Si3N4 powder and sintering additives containing MgSiN2 as raw materials, and the weight ratio of the Si3N4 powder and the sintering additives containing MgSiN2 is 100:9-1. The rawmaterials are shaped and held in a graphite die or the raw materials is held in the graphite die after uniformly mixing the raw materials, the raw materials is sintered under the conditions that mechanical pressure is 10-80MPa, nitrogen pressure is 0.8-5MPa, temperature is 1900DEG C-2300DEG C, and insulating time is 20-60 hours, after being sintered, the sample is cold in the die to room temperature, and the transparent beta-silicon nitride ceramic is obtained. The invention employs MgSiN2 powder as sintering aid to combine with high-temperature heat pressing sintering to decrease the contentof crystal boundary phase and the difference between crystal boundary phase and beta-Si3N44 crystal particle, thereby effectively decreasing the loss of light and realizing transparentizing of beta-silicon nitride ceramic.

Description

(1) Technical field: [0001] The invention relates to the field of non-oxide ceramics, in particular to a transparent β-silicon nitride ceramic and a preparation method thereof. (two) background technology: [0002] An important application of transparent ceramics is that they are used as structural components in modern high-tech equipment such as transparent armor, tactical and strategic missiles, aerospace aircraft, and unmanned combat vehicles. These equipment are usually used in very harsh environments such as high temperature, field, space, battlefield, etc., which requires that the transparent materials used not only have light transmission, but also have good mechanical properties, thermal shock resistance and chemical stability, etc. Comprehensive performance to improve its reliability. However, transparent structural ceramics such as Al 2 o 3 , MgAl 2 o 4 , AlON, α-Sialon and other mechanical properties and thermal shock resistance are not ideal, and it is diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/645C04B35/584
Inventor 彭桂花梁振华李庆余王红强梁敏李向果
Owner 烟台同立高科新材料股份有限公司
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