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Method for preparing titanium-diboride-based ceramic composite material

A technology of ceramic composite materials and titanium diboride, which is applied in the field of ceramic materials, can solve the problems of low density, deformation, and high cost of hot pressing, and achieve the effects of excellent properties, simple method steps, and low temperature requirements

Active Publication Date: 2015-11-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current titanium diboride products are mainly prepared by pressureless sintering and hot pressing sintering methods. The pressureless sintering steps include mixing, forming and sintering. The sintering temperature is generally around 2000 ° C. Titanium diboride produced by pressureless sintering The density of the product is low, so that its technical performance indicators cannot meet the requirements of various products; in addition, a second phase (such as TiC, TiN and SiC, etc.) is added to titanium diboride ceramics to form particle-reinforced TiB 2 Ceramic-based composite materials can increase the fracture toughness of titanium diboride ceramics. However, due to its deformation, cracking and high cost in the sintering process, it also encounters many difficulties in actual production; The main method of dense titanium diboride products, the steps include mixing and hot pressing sintering; the sintering temperature is generally above 1800 ° C, and the cost of hot pressing is high, and it is difficult to process complex shapes by hot pressing components; the above problems have greatly restricted the popularization and application of titanium diboride ceramic materials

Method used

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  • Method for preparing titanium-diboride-based ceramic composite material
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  • Method for preparing titanium-diboride-based ceramic composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] TiB with particle size 2 powder, molded under a pressure of 50MPa, and then dried at 50°C for 10h to obtain TiB 2 Biscuit;

[0030] Place silicon particles on the upper surface of the green body and place it in a vacuum heating furnace. Under the condition of vacuum degree ≤ 100Pa, the temperature is raised to 1450°C at a rate of 10°C / min, and then kept for 60min to obtain a dense titanium diboride-based ceramic composite material. ; its phase composition is TiB 2 and Si.

[0031] After testing, the Vickers hardness of the titanium diboride-based ceramic composite material is 11GPa, the flexural strength is 130MPa, and the fracture toughness is 3.7MPa m 1 / 2 , the open porosity is 0.63%, and the bulk density is 3.64g / cm 3 , the relative density is 91.23%.

Embodiment 2

[0033] Phenolic resin solution, TiB particle size 2 Mix the powder and water evenly, among them, the C element in the phenolic resin solution and the TiB 2 The weight ratio of the powder is 1:24, and the weight ratio of C element and water in the phenolic resin solution is 1:8, and then dried at 110-120°C for 12 hours to remove moisture and make TiB 2 mixed powder;

[0034] TiB 2 The mixed powder is sieved, and the particles with a particle size of 24-60 mesh are selected and put into a mold, molded under a pressure of 100MPa, and then dried at 150°C for 10h to obtain TiB 2 base blank;

[0035] Place silicon particles on the upper surface of the green body and place it in a vacuum heating furnace. Under the condition of vacuum degree ≤ 100Pa, the temperature is raised to 1500°C at a rate of 3°C / min, and then kept for 60min to obtain a dense titanium diboride-based ceramic composite. material; its phase composition is TiB 2 , SiC and Si;

[0036] After testing, the Vickers...

Embodiment 3

[0038] Water-soluble phenolic resin powder, TiB with particle size 2 The powder and water are mixed evenly, and the phenolic resin is dissolved in water, among which, the C element in the phenolic resin powder and TiB 2 The weight ratio of the powder is 1:15.67, and the weight ratio of the C element in the phenolic resin powder to water is 1:16, and then dried at 110-120°C for 10 hours to remove moisture and make TiB 2 mixed powder;

[0039] TiB 2 The mixed powder is sieved, and the particles with a particle size of 24-60 mesh are selected and put into a mold, molded under a pressure of 150MPa, and then dried at 100°C for 12 hours to obtain TiB 2 base blank;

[0040] Place silicon particles on the upper surface of the green body and place it in a vacuum heating furnace. Under the condition of vacuum degree ≤ 100Pa, the temperature is raised to 1550°C at a rate of 5°C / min, and then kept for 50min to obtain dense titanium diboride-based ceramics. Composite material; its phase...

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Abstract

The invention provides a method for preparing a titanium-diboride-based ceramic composite material in order to solve problems existing in an existing method for preparing the titanium-diboride-based ceramic composite material, and belongs to the technical field of materials. The method includes the following steps that (1) TiB2 powder is evenly mixed with a carbon source and screened, and particles with the particle size ranging from 24 meshes to 60 meshes are selected as mould pressing materials; (2) the mould pressing materials are subjected to mould pressing and dried to obtain a TiB2-based biscuit; (3) the TiB2-based biscuit serves as a framework, Si is adopted as an infiltration agent for vacuum infiltration. The method is simple in step and low in temperature requirement, the titanium-diboride-based ceramic composite material high in compactness can be obtained under the condition that preparing cost is low, and the size change of a sample in the preparing process is smaller than 0.1%, so that the method belongs to net-size sintering. Besides, the method can be used for producing products in various complex shapes.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a preparation method of a titanium diboride-based ceramic composite material. Background technique [0002] Titanium diboride (TiB 2 ) Ceramics are widely used in metallurgy, machinery, military, chemical and electronic industries due to their excellent properties such as high melting point, high hardness, wear resistance, corrosion resistance, oxidation resistance, good electrical conductivity and thermal conductivity. [0003] The current titanium diboride products are mainly prepared by pressureless sintering and hot pressing sintering methods. The pressureless sintering steps include mixing, forming and sintering. The sintering temperature is generally around 2000 ° C. Titanium diboride produced by pressureless sintering The density of the product is low, so that its technical performance indicators cannot meet the requirements of various products; in a...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/65
Inventor 张翠萍茹红强王伟岳新艳张宁张廷安
Owner NORTHEASTERN UNIV
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