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Preparation method of high-toughness boride-carbide composite ceramic

A technology of composite ceramics and borides, which is applied in the field of preparation of boride-carbide composite ceramics, can solve the problems of high production cost, poor mechanical properties and high pressure of boride-carbide composite ceramics, and achieve crystallization Uniform particle size and distribution, excellent comprehensive mechanical properties, and reduced production costs

Active Publication Date: 2012-06-20
吉林长玉特陶新材料技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high sintering temperature and high pressure in the preparation of existing boride-carbide composite ceramics, resulting in high production costs, poor mechanical properties and poor fracture toughness of the prepared boride-carbide composite ceramics Problem, the present invention provides a method for preparing high toughness boride-carbide composite ceramics

Method used

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specific Embodiment approach 1

[0017] Specific Embodiment 1: This embodiment is a preparation method of high-toughness boride-carbide composite ceramics, which is realized through the following steps: 1. Weigh 20% to 80% of boride and 20% to 20% by weight percentage 80% carbide, then add the weighed boride and carbide into the dispersion medium, and mix uniformly to obtain a mixed powder. The dispersion medium is ethanol or acetone with a concentration of not less than 98% by volume; Dry the obtained mixed powder at 100°C-150°C for 10-48 hours, then put the dried mixed powder into a ball mill, add polyvinyl alcohol dispersant, and then ball-mill in an argon protective atmosphere for 6-48 hours, The mixed powder after ball milling is passed through a 200-mesh sieve to obtain a uniformly mixed nano-scale composite powder; 3. The nano-scale composite powder obtained in step 2 is pressed into a billet under a pressure of 150-250 MPa, and then the billet is subjected to two-stage non-toxic Pressure sintering: un...

specific Embodiment approach 2

[0023] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the boride in step one is a transition metal boride, and the carbide is boron carbide (B 4 C), silicon carbide (SiC) or transition metal carbide, wherein the transition metal boride is selected from one of the IV~VI subgroups of the periodic table, and the transition metal in the transition metal carbide is selected from IV of the periodic table One of the ~VI subfamily. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the boride in step one is titanium diboride (TiB 2 ), zirconium diboride (ZrB 2 ), hafnium diboride (HfB 2 ), vanadium diboride (VB 2 ), niobium diboride (NbB 2 ) or tantalum diboride (TaB 2 ); the carbide is boron carbide (B 4 C), silicon carbide (SiC), titanium carbide (TiC), zirconium carbide (ZrC), hafnium carbide (HfC), vanadium carbide (VC), niobium carbide (NbC) or tantalum carbide (TaC). Other steps and parameters are the same as those in Embodiment 1.

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Abstract

A preparation method of a high-toughness boride-carbide composite ceramic relates to a preparation method of a boride-carbide composite ceramic and solves the problems that in the conventional preparation of the boride-carbide composite ceramic, due to high sintering temperature and high sintering pressure, the preparation cost is high and the prepared boride-carbide composite ceramic is poor in mechanical property and fracture toughness. The preparation method of the high-toughness boride-carbide composite ceramic comprises the following steps : adding a dispersing medium into boride and carbide; uniformly mixing the dispersing medium, the boride and the carbide; pressing the mixture into a blank material; and sintering the blank material in a two-section pressure-free sintering way at alow temperature and a high temperature sequentially. The sizes and the distribution of grain crystals in the boride-carbide composite ceramic which is prepared under the low-temperature pressure-freeconditions are uniform; the fracture toughness is as high as 5.0-13MPa.m<-1 / 2>; and the bending strength is as high as 400-1000 MPa; the boride-carbide composite ceramic with excellent comprehensive mechanical property can be prepared; the preparation cost is reduced; and the application range is widened.

Description

technical field [0001] The invention relates to a preparation method of boride-carbide composite ceramics. Background technique [0002] With the development of high-temperature technology, materials are required to have excellent high-temperature comprehensive properties to adapt to harsh high-temperature environments, such as high high-temperature strength, good thermal shock resistance, and high-temperature ablation resistance. Non-oxide composite ceramic materials are a kind of high-temperature engineering materials with great development prospects. It uses the complementarity of material properties to achieve comprehensive optimization of materials, among which boride-carbide composite ceramics are one of them. [0003] Boride ceramic materials can maintain good physical and chemical stability in high-temperature environments and reaction atmospheres, and their melting points exceed 3000 °C. Due to their excellent physical properties (high melting point, thermal conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/58C04B35/622
Inventor 王玉金李海霞陈磊胡志毅周玉
Owner 吉林长玉特陶新材料技术股份有限公司
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