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Preparation method of silicon nitride-hafnium carbide composite ceramics

A technology of complex phase ceramics and hafnium carbide, which is applied in the field of ceramic materials, can solve the problems of unreachable, low density, and influence on mechanical properties, and achieve the effect of easy operation and good hardness

Active Publication Date: 2016-06-22
泰晟新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the density of this sintering method is low, and the mechanical properties are also affected.
In order to improve the mechanical properties, the existing technology has a preparation method of adding boron nitride, zirconia, and yttrium oxide auxiliary materials to silicon nitride. Although it has improved compared with pure reaction sintered silicon nitride, it has not yet reached the ideal level. Therefore, to continue to find a way to improve the mechanical properties of reaction sintered silicon nitride composite ceramics has become a difficulty in engineering ceramics

Method used

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  • Preparation method of silicon nitride-hafnium carbide composite ceramics
  • Preparation method of silicon nitride-hafnium carbide composite ceramics
  • Preparation method of silicon nitride-hafnium carbide composite ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) The metal silicon powder is pickled with dilute hydrochloric acid with a mass concentration of 8% for 16 hours, then washed with deionized water and dried at a drying temperature of 80° C. to obtain spare metal silicon powder. 700g of metal silicon powder with a median diameter of 20 microns and a content of 99%, a median diameter of 50 microns with a content of 99.5% hafnium carbide 220g, a median diameter of 5 microns and a 98% content of zirconium boride 50g, and a median diameter of 50 microns Combining 99% Aronite with 30g spinel and 1500g anhydrous ethanol is charged into a ball mill for 16 hours to obtain a uniformly mixed slurry. The slurry is dried in a vacuum drying oven at 60°C for 10 hours and passed through a 40-mesh sieve to obtain a preformed powder material;

[0026] (2) Place the preformed powder in a mold and press it into a blank with a thickness of 8mm, and treat the blank with cold isostatic pressing. The pressure of the cold isostatic pressing is ...

Embodiment 2

[0030] (1) The metal silicon powder is pickled with dilute hydrochloric acid with a mass concentration of 10% for 20 hours, then washed with deionized water and dried at a drying temperature of 100°C to obtain spare metal silicon powder. 780g of metallic silicon powder with a median diameter of 25 microns and a content of 99%, a median diameter of 40 microns with a content of 99.5% hafnium carbide 160g, a median diameter of 10 microns and a 98% content of zirconium boride 40g, and a median diameter of 40 microns Combining 99% Aronite with 20g spinel and 1600g anhydrous ethanol is charged into a ball mill for 20 hours to obtain a uniformly mixed slurry. The slurry is dried in a vacuum drying oven at 70°C for 13 hours and passed through a 50-mesh sieve to obtain a preformed powder material;

[0031] (2) Place the preformed powder in a mold and press it into a blank with a thickness of 10mm, and treat the blank with cold isostatic pressing. The pressure of the cold isostatic pressin...

Embodiment 3

[0035] (1) The metal silicon powder is pickled with dilute hydrochloric acid with a mass concentration of 12% for 24 hours, then washed with deionized water and dried at a drying temperature of 90°C to obtain spare metal silicon powder. 840g of metal silicon powder with a median diameter of 35 microns and a content of 99%, a median diameter of 45 microns with a content of 99.5% hafnium carbide 120g, a median diameter of 8 microns and a 98% content of zirconium boride 20g, and a median diameter of 45 microns Combining 99% Aronite with 20g spinel and 1800g anhydrous ethanol is charged into a ball mill for 24 hours to obtain a uniformly mixed slurry. The slurry is dried in a vacuum drying oven at 80°C for 16 hours and passed through a 60-mesh sieve to obtain a preformed powder material;

[0036] (2) Place the preformed powder in a mold and press it into a blank with a thickness of 12mm, and treat the blank with cold isostatic pressing. The pressure of the cold isostatic pressing is ...

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Abstract

The invention belongs to the technical field of ceramic materials and specifically relates to a preparation method of silicon nitride-hafnium carbide composite ceramic. The silicon nitride-hafnium carbide composite ceramic is prepared from the following raw materials in percentage by weight: 70-90% of metal silicon powder, 6-22% of hafnium carbide, 2-5% of zirconiumboride, and 1-3% of AlON-bonded spinel. The preparation method comprises the following steps: the raw materials and a medium are ball-milled to obtain an evenly mixed slurry, and drying and sieving the slurry to obtain pre-molded powder; putting the pre-molded powder in a die and pressing into a biscuit, and performing isostatic cool pressing treatment on the biscuit to obtain a pre-sintered body; putting the pre-sintered body into a vacuum sintered furnace and introducing nitrogen for sintering, thereby obtaining the silicon nitride-hafnium carbide composite ceramic. Compared with gas pressure sintered or hot-pressing sintered silicon nitride and the composite ceramic thereof, the silicon nitride-hafnium carbide composite ceramic has better hardness, bending strength and fracture toughness; the product size does not shrink, and the semi-finished product is machinable and suitable for preparing the products in complex shapes; in addition, the preparation method is simple and convenient to operate, and applicable to large-scale industrial production.

Description

Technical field [0001] The invention belongs to the technical field of ceramic materials, and specifically relates to a preparation method of a silicon nitride-hafnium carbide composite ceramic. Background technique [0002] Silicon nitride ceramics have excellent high-temperature mechanical properties and are recognized as one of the most promising high-temperature structural ceramic materials. Silicon nitride belongs to the hexagonal system and is made of [SiN4] 4- The three-dimensional space network formed by tetrahedrons sharing vertex angles is a covalently bonded compound with strong structure, small diffusion coefficient, and no molten state. It decomposes into nitrogen and silicon at about 1900°C. It is difficult to sinter, and its mechanical properties, high temperature properties and chemical stability Excellent sex. Usually silicon nitride ceramics have reaction sintering, air pressure sintering and hot press sintering. Hot-pressed sintering has high density and high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/56C04B35/622
Inventor 郭瑞本孙兆江孙百忠
Owner 泰晟新材料科技有限公司
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