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Preparation method of complex phase ceramic material containing zirconium boride

A technology of multiphase ceramics and zirconium boride is applied in the field of preparation of ceramic materials, which can solve the problems of reducing the microstructure uniformity and comprehensive mechanical properties of multiphase ceramic materials, high activity of reactants, and not easy to control, so as to inhibit the pores and The effect of local tissue segregation, control of reaction intensity, and inhibition of particle size and uneven distribution

Inactive Publication Date: 2011-09-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that in the process of preparing multi-phase ceramic materials by the existing reaction sintering method, due to the high activity of the reactants, it is not easy to control, and the local temperature is too high due to the severe local reaction in the sintering process, which will cause the abnormal growth of the crystal grains. , there are material defects such as phase segregation, which reduce the microstructure uniformity and comprehensive mechanical properties of the composite ceramic material, and provide a method for preparing a zirconium boride-containing composite ceramic material

Method used

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specific Embodiment approach 1

[0010] Specific embodiment 1: The preparation method of a zirconium boride-containing composite ceramic material in this embodiment is realized by the following steps: 1. The volume ratio of zirconium oxide and boron-containing compound is (3-8): (2~ 7) Mix or mix the zirconium oxide and the boron-containing composition in a volume ratio of (3~8): (2~7), put it in a ball mill, and use distilled water, absolute ethanol, acetone or 98% ethanol by volume As the dispersion medium, wet ball milling for 12 to 48 hours to form a composite powder; 2. Dry the composite powder at a temperature of 100 to 150°C for 10 to 48 hours, and then crush the dried powder through a 200 mesh sieve to obtain a uniform mixed powder; 3. After molding or cold isostatic pressing of the mixed powder obtained in step 2, pressureless sintering, hot pressing sintering or hot isostatic pressing sintering is performed to obtain a zirconium boride-containing composite ceramic material; wherein, in step 1, a boron...

specific Embodiment approach 2

[0012] Specific embodiment two: this embodiment is different from specific embodiment one in that the carbon in the boron-containing composition in step one is elemental carbon or is generated by high-temperature cracking of organic matter; wherein the organic matter is phenol resin, urea resin, epoxy One or a combination of resin or asphalt. The other steps and parameters are the same as in the first embodiment.

[0013] When the organic matter is a composition in this embodiment, various organic matter is combined in any ratio.

specific Embodiment approach 3

[0014] Specific embodiment three: This embodiment is different from specific embodiment one or two in that in step two, one or a combination of oxides, carbides or nitrides can also be added to the composite powder. The other steps and parameters are the same as in the first or second embodiment.

[0015] When the additive added to the composite powder in this embodiment is a composition, the various additives are combined in any ratio.

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Abstract

The invention relates to a preparation method of a complex phase ceramic material containing zirconium boride, relating to a preparation method of ceramic materials and aiming to overcome the material defects of abnormal crystal grain growth, phase clustering, and the like which are caused by difficult control and overhigh partial temperature in the traditional reaction sintering preparation method and solve the problems of tissue uniformity and comprehensive mechanical property of the complex phase ceramic material. The preparation method comprises the following steps of: 1, placing zirconium oxide and a boron-containing compound or a boron-containing composite into a ball mill to form composite powder; 2, drying the composite powder, then crushing, and screening through a sieve of 200 meshes to obtain uniform mixed powder; 3, carrying out mould pressing or cold isostatic pressing on the mixed powder, and then carrying out pressureless sintering, hot pressing sintering or hot isostatic pressing sintering to obtain the complex phase ceramic material containing the zirconium boride. The complex phase ceramic material containing the zirconium boride has uniform crystal grain size and distribution, the fracture toughness of 3.5-7.5 MPa.m<-1 / 2> and the bending strength of 250-700 MPa and can be used in the field of high-temperature resistant structural members and the like.

Description

Technical field [0001] The invention relates to a method for preparing ceramic materials. Background technique [0002] The reaction sintering technology is to allow the solid phase reaction between the original components, or the solid-gas (liquid) reaction between the original components and the external gas (liquid), to synthesize a new phase according to the pre-designed composition and achieve compact sintering at the same time A new type of sintering technology for preparing multiphase ceramics. Compared with conventional sintering technology, this technology has the advantages of low raw material cost, simple process, and special structure design and special complex structure and special properties can be achieved through specific means. At the same time, if an external force is applied during the reaction sintering process, it is easier to sinter the multiphase ceramic material to be dense. Comparing with the traditional hot-press sintering, it can significantly reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 王玉金陈磊周玉贾德昌
Owner HARBIN INST OF TECH
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