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Method for preparing boron-carbide-based ceramic composite material

A ceramic composite material, boron carbide-based technology, applied in the field of materials, to achieve the effect of simple steps and low temperature requirements

Active Publication Date: 2013-06-12
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the existing methods for preparing boron carbide ceramic composite materials, the present invention provides a method for preparing boron carbide-based ceramic composite materials. The raw materials are molded first, and then siliconized in a pressureless vacuum. The sintering temperature is low and the sintering In the case of no deformation in the process, a boron carbide ceramic composite material with stable performance is produced

Method used

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  • Method for preparing boron-carbide-based ceramic composite material
  • Method for preparing boron-carbide-based ceramic composite material
  • Method for preparing boron-carbide-based ceramic composite material

Examples

Experimental program
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Embodiment 1

[0038] Will B 4 C powder is mixed evenly with the binder, and the mixing ratio is that the binder accounts for B 4 10% of the total weight of C powder, and then sieved, and the part with a particle size of 24~60 mesh was selected as the molding material and put into the mold, molded under the pressure of 200MPa, and then dried at 450°C for 10h to obtain B 4 C-C biscuit;

[0039] Binding agent is polyvinyl alcohol aqueous solution, wherein the weight concentration of polyvinyl alcohol is 5%;

[0040] Will B 4 The C-C green body is used as the skeleton, Si is used as the infiltration agent, and vacuum infiltration is carried out. The vacuum degree of infiltration is ≤100Pa. The infiltration process is firstly heated to 1350°C at a speed of 3~10°C / min, and then kept for 30 minutes to obtain Boron carbide ceramic composite material;

[0041] The phase composition of boron carbide ceramic composites is B 4 C, SiC, Si, B 13 C 2 and B 12.97 Si 0.03 C 2 ;

[0042] The Vicke...

Embodiment 2

[0044] Carbon black powder, B 4 C powder and water are mixed evenly, and the amount added is based on the C element and B in the carbon black powder 4 The weight ratio of C powder is 1:15.67, and the weight ratio of C element in carbon black powder to water is 1:16, and then dried to remove moisture to make B 4 C mixed powder;

[0045] Will B 4 C mixed powder and binder are mixed evenly, and the mixing ratio is that the binder accounts for B 4 C mixes 10% of the total weight of the powder, and then sieves, selects the part with a particle size of 24~60 mesh as the molding material, puts it into the mold, molds it under a pressure of 50MPa, and then dries it at 350°C for 10 hours to obtain B 4 C-C green body; binder is carboxymethyl cellulose aqueous solution, and the weight concentration of carboxymethyl cellulose is 6%;

[0046] Will B 4 The C-C biscuit is used as the skeleton, and Si is used as the infiltration agent to carry out vacuum infiltration. The vacuum degree o...

Embodiment 3

[0050] Graphite powder, B 4 C powder and water are mixed evenly, and the amount added is based on the C element and B in the graphite powder 4 The weight ratio of C powder is 1:11.5, and the weight ratio of C element in graphite powder to water is 1:12, and then dried to remove moisture to make B 4 C mixed powder;

[0051] Will B 4 C mixed powder and binder are mixed evenly, and the mixing ratio is that the binder accounts for B 4 C mixes 15% of the total weight of the powder, and then sieves, selects the part with a particle size of 24~60 mesh as the molding material, puts it into the mold, molds it under a pressure of 100MPa, and then dries it at 250°C for 12 hours to obtain B 4 C-C green body; binder is polyvinylpyrrolidone aqueous solution, and the weight concentration of polyvinylpyrrolidone is 8%;

[0052] Will B 4 The C-C green body is used as the skeleton, Si is used as the infiltration agent, and vacuum infiltration is carried out. The vacuum degree of infiltrati...

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Abstract

The invention relates to a method for preparing a boron-carbide-based ceramic composite material, belonging to the technical field of materials. The method comprises the following steps of: (1) uniformly mixing B4C powder and a binding agent, or uniformly mixing B4C mixed powder and the binding agent, screening the mixture, and selecting particles with particle size of between 24 and 60 meshes asa die pressing material; (2) forming the die pressing material through die pressing, and drying the formed material to obtain a B4C-C blank; (3) taking the B4C-C blank as a skeleton and Si as an infiltrating agent to perform vacuum infiltration. The method provided by the invention has simple steps and low temperature requirement, the high-density boron carbide ceramic composite material can be obtained under the condition of lower preparation cost, the dimension change of a sample is less than 0.1% during preparation, and the method belongs to clear dimension sintering. Moreover, various shapes of complex products can be produced by using the method.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a boron carbide-based ceramic composite material. Background technique [0002] Boron carbide (B 4 C) Ceramics are widely used in military, machinery, chemical, aerospace and energy industries due to their characteristics of low density, superhardness, high melting point, chemical corrosion resistance and good neutron absorption capacity. [0003] The current boron carbide products are mainly prepared by pressureless sintering and hot-pressing sintering methods. The pressureless sintering steps include mixing, molding and sintering. The sintering temperature is generally around 2000°C. Low, resulting in its technical performance indicators can not meet the requirements of various products; in addition, adding a second phase (such as TiB 2 , ZrB 2 and SiC, etc.) to form particle-reinforced B 4 C-based ceramic composite materials can increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 茹红强张翠萍岳新艳王伟常青
Owner NORTHEASTERN UNIV LIAONING