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 difficult to control, etc. The effect of local tissue segregation, control of reaction intensity, and inhibition of particle size and uneven distribution

Inactive Publication Date: 2012-12-05
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 one: the preparation method of a kind of boride-containing zirconium composite ceramic material in this embodiment is realized according to the following steps: one, the volume ratio of zirconium oxide and boron-containing compound is (3~8): (2~ 7) Mix or mix zirconium oxide and boron-containing composition in a volume ratio of (3-8): (2-7), put them in a ball mill, and mix them with distilled water, absolute ethanol, acetone or ethanol with a volume fraction of 98%. 2. Dry the composite powder at a temperature of 100-150°C for 10-48 hours, and then crush the dried powder through a 200-mesh sieve to obtain a uniform mixed powder; 3. After the mixed powder obtained in step 2 is molded or cold isostatic pressed, it is then subjected to pressureless sintering, hot pressing sintering or hot isostatic pressing sintering to obtain a zirconium boride-containing composite ceramic material; wherein the boron compound in step 1 It is boron carbide; the boron-c...

specific Embodiment approach 2

[0012] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the carbon in the boron-containing composition in step 1 is simple carbon or is generated by high-temperature cracking of organic matter; wherein the organic matter is phenolic resin, urea-formaldehyde resin, epoxy One or a combination of resin or asphalt. Other steps and parameters are the same as those in the first embodiment.

[0013] In this embodiment, when the organic matter is a composition, various organic matter can be combined in any proportion.

specific Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 2, one or a combination of oxides, carbides or nitrides can be added to the composite powder. Other steps and parameters are the same as those in Embodiment 1 or 2.

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

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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 preparation method of a ceramic material. Background technique [0002] Reaction sintering technology is a solid-phase reaction between the original components, or a solid-gas (liquid) reaction between the original components and the external gas (liquid) body, so as to synthesize a new phase according to the pre-designed composition and achieve sintering density at the same time. A new type of sintering technology for the preparation of multiphase ceramics. Compared with the conventional sintering technology, this technology has the advantages of low cost of raw materials, simple process, special structural design and special multi-phase structure and special performance can be obtained through specific means. At the same time, if an external force is applied during the reaction sintering process, it will be easier to sinter and compact the composite ceramic material. Complementing the heat provided by the outside through ...

Claims

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Application Information

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Patent Type & Authority Patents(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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