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Method for preparing zirconium diboride based ceramic composite material at low temperature

A ceramic composite material and diboration technology are applied in the field of preparation of inorganic composite materials, which can solve the problems of difficult preparation of ceramic materials and complicated preparation process of composite powder, and achieve the effects of excellent performance, reduced loss and improved yield.

Active Publication Date: 2015-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coated ZrB in the above method 2 The preparation process of composite powder is complicated, and it is not easy to prepare bulk ZrB 2 Ceramic material
[0006] So far, there is no literature record of low temperature preparation (<1800°C) ceramic matrix composites by adding metal elements

Method used

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  • Method for preparing zirconium diboride based ceramic composite material at low temperature
  • Method for preparing zirconium diboride based ceramic composite material at low temperature
  • Method for preparing zirconium diboride based ceramic composite material at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] ZrB of this embodiment 2 The base ceramic composite consists of the following volume percent components ZrB 2 85% and SiC15%:

[0059] 1) Ingredients ball milling: weigh ZrB 2 powder 91.4g, SiC powder 8.6g, weighed ZrB 2 and SiC powder into the ball mill jar, then add 150g of ethanol to the mixed powder for deployment and add steel balls with a volume twice the powder volume for ball milling (filling rate is 50%), the ball milling speed is 150r / min, and the ball milling time is 8 hours , to obtain a uniformly mixed slurry;

[0060] 2) Drying of the mixed powder: Put the slurry obtained in step 1) into a vacuum oven for 8 hours at a drying temperature of 60°C to obtain agglomerated powder, which is ground through an 80-mesh sieve to obtain a ceramic prefabricated powder;

[0061] 3) Sintering and densification process: Put ceramic prefabricated powder directly into a graphite mold with a diameter of 55mm, put the mold into a spark plasma sintering furnace, apply an a...

Embodiment 2

[0063] ZrB of this embodiment 2 The base ceramic composite consists of the following volume percent components ZrB 2 70% and SiC30%:

[0064] 1) Ingredients ball milling: weigh ZrB 2 powder 81.4g, SiC powder 18.6g, weighed ZrB 2 and SiC powder into the ball mill jar, then add 150g of ethanol to the mixed powder for preparation and add steel balls with a volume twice the powder volume for ball milling (filling rate is 55%), the ball milling speed is 130r / min, and the ball milling time is 10 hours , to obtain a uniformly mixed slurry;

[0065] 2) Mixed powder drying: Put the slurry obtained in step 1) into a vacuum oven for 8 hours at a drying temperature of 60° C. to obtain agglomerated powder, which is ground through a 200-mesh sieve to obtain ceramic prefabricated powder;

[0066] 3) Sintering and densification process: Put ceramic prefabricated powder directly into a graphite mold with a diameter of 55mm, put the mold into a spark plasma sintering furnace, apply an axial...

Embodiment 3

[0068] ZrB of this embodiment 2 The base ceramic composite consists of the following volume percent components ZrB 2 96% and Fe4%:

[0069] 1) Ingredients ball milling: weigh ZrB 2 powder 94.9g, Fe powder 5.1g, weighed ZrB 2 And Fe powder is added in the ball mill jar, then in mixed powder, add 150g ethanol and carry out allocation and add the steel ball that volume is powder volume 2 times and carry out ball milling (fill rate 60%), ball milling speed 130r / min, ball milling time 4 hours , to obtain a uniformly mixed slurry;

[0070] 2) Mixed powder drying: Put the slurry obtained in step 1) into a vacuum oven for 8 hours at a drying temperature of 60° C. to obtain agglomerated powder, which is ground through a 200-mesh sieve to obtain ceramic prefabricated powder;

[0071] 3) Sintering and densification process: Put ceramic prefabricated powder directly into a graphite mold with a diameter of 55mm, put the mold into a spark plasma sintering furnace, apply an axial pressur...

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Abstract

The invention relates to a method for preparing a zirconium diboride based ceramic composite material at a low temperature, and belongs to the technical field of preparation of inorganic composite materials. Pre-produced ceramic powder obtained by mixing zero-valent iron and ceramic powder is subjected to pressure sintering, and the zirconium diboride based ceramic composite material whose density is larger than or equal to 93% is obtained; the ceramic powder comprises zirconium boride powder; the pressure sintering temperature ranges from 1,200 DEG C to 2,000 DEG C, and the pressure ranges from 5 MPa to 100 MPa; the mass of the zero-valent iron is 0.1%-15% of that of the ceramic powder. The preparation process is simple; the prepared zirconium diboride based ceramic composite material has excellent performance; the problems of high energy consumption, low finished product rate, over-high brittleness of a finished product and the like in a conventional preparation process are solved.

Description

technical field [0001] The invention relates to a method for preparing a zirconium diboride-based ceramic composite material at low temperature, and belongs to the technical field of preparation of inorganic composite materials. Background technique [0002] Ultra-high temperature ceramics are transition metal borides, carbides and nitrides that can be used in aerobic or complex environments above 2000 °C and have excellent properties. Because of its many excellent properties: high temperature resistance, corrosion resistance, low density, high strength and unique electromagnetic properties, it has an extremely wide range of research fields and high research value. [0003] Among many ultra-high temperature ceramics, zirconium boride (ZrB 2 )-based ultra-high temperature ceramics have the characteristics of low density, oxidation resistance, corrosion resistance, and excellent mechanical properties at high temperatures, and have great potential for development in a series o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/14
Inventor 熊翔张响刘如铁吴宣城陈招科孙威朱银宇王滴泥
Owner CENT SOUTH UNIV
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