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Method for preparing composite ceramic material containing boron carbide and rare earth

A ceramic material and rare earth composite technology, which is applied in the field of materials, can solve the problems of high brittleness and difficult processing of products, and achieve the effects of improving electrical conductivity, reducing production costs, and speeding up EDM cutting

Active Publication Date: 2010-04-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the particularity of the properties of boron carbide, the products produced by hot pressing still have the disadvantages of high brittleness and difficulty in processing.
The above problems are the reasons that limit the wide application of boron carbide ceramic materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] Example 1: Ingredients, using CeO in rare earth oxides 2 The content of REO relative to the total amount of rare earth oxides is CeO 2 / REO=99%, the purity of REO is 98%, the loss on ignition is 1%, and the addition is 1% (mass percentage); the purity of the rare earth boride is 98% based on lanthanum, and the total amount of lanthanum and rare earth elements than 95% where REB 6 It is 97%, and the addition amount is 8% (mass percentage); the balance is boron carbide powder, its purity is 96%, and its average particle size is 2.0 μm. The prepared raw materials were uniformly mixed for 12 hours in a ceramic tank and ball mixer and then loaded into graphite molds.

[0012] Hot-press sintering, put the charged graphite mold into the hot-press sintering furnace, evacuate to below 0.1Pa, then raise the temperature to 1850°C at a speed of 5°C / min, keep warm for 30 minutes, slowly pressurize to 20MPa, and continue to keep warm 30 minutes. The obtained boron carbide rare ea...

example 2

[0013] Example 2: Ingredients, using CeO in rare earth oxides 2 The content of REO relative to the total amount of rare earth oxides is CeO 2 / REO=99%, the purity of REO is 98%, the loss on ignition is 1%, the amount added by mass percentage is 4%, the ratio of gadolinium to the total amount of rare earth elements in rare earth borides is 85%, and its purity is 98%. , where REB 6 It is 97%, the addition amount is 6% by mass percentage, the balance is boron carbide powder, its purity is 96%, and the average particle diameter is 2.0 μm. The prepared raw materials were uniformly mixed for 12 hours in a ceramic tank and ball mixer and then loaded into graphite molds.

[0014] Hot-press sintering, put the charged graphite mold into the hot-press sintering furnace, evacuate to below 0.1Pa, and then raise the temperature to 1900°C at a rate of 5°C / min. Keep warm for 20 minutes, slowly pressurize to 20MPa, and keep warm for 30 minutes. The obtained boron carbide rare earth composi...

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PUM

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Abstract

A composite boron carbide-RE ceramic is prepared through proportionally mixing boron carbide powder, RE oxide powder and RE boride powder, loading the mixture in graphite mould, putting it in sinter furnace, vacuumizing, heating at 1800-2050 deg.C for 10-90 min, and pressurizing to 5-30 MPa for 10-90 min. It has high hardness and breaking toughness.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a preparation method of a boron carbide rare earth composite ceramic material. Background technique [0002] Boron carbide has extraordinary hardness, especially the advantage of constant high temperature hardness is unmatched by diamond. In addition, it has good acid and alkali corrosion resistance, high neutron absorption capacity and low density. It is the key development content of friction products, nuclear industry neutron protection materials, bulletproof materials and other fields. [0003] At present, there are two methods for manufacturing boron carbide ceramic materials: hot pressing sintering and pressureless sintering. The density of boron carbide products manufactured by pressureless sintering is low, so that its technical performance indicators cannot meet the requirements of various products. The liquid phase sintering method with the addition of sintering aid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/645
Inventor 吴文远任存治涂赣峰徐璟玉孙树臣高波
Owner NORTHEASTERN UNIV LIAONING