Method for preparing titanium diboride ceramic with titanium aluminum carbon as sintering aid

A sintering aid, titanium diboride technology, applied in the field of boride ceramics, can solve the problem of difficult sintering of titanium diboride ceramics, and achieve the effects of easy control of process conditions, excellent mechanical properties, and low densification temperature

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing titanium diboride ceramics using ternary layered carbide titanium aluminum carbon as a sintering aid, which can solve the problem of difficult sintering of titanium diboride ceramics

Method used

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  • Method for preparing titanium diboride ceramic with titanium aluminum carbon as sintering aid
  • Method for preparing titanium diboride ceramic with titanium aluminum carbon as sintering aid
  • Method for preparing titanium diboride ceramic with titanium aluminum carbon as sintering aid

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Experimental program
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Embodiment 1

[0024] The raw material is TiB with a particle size of 2500 mesh 2 Powder 28.5 grams, 2000 mesh 3 AlC 2 1.5 grams of powder were ball-milled in an alcoholic medium for 20 hours, cold-pressed into a cake shape under a pressure of 10 MPa, and the cold-pressing time was 8 minutes. In the middle, the heating rate was raised to 1400° C. at a rate of 5° C. / min for 2 hours, and the hot pressing pressure was 40 MPa. A material composed of two phases of titanium boride and titanium carbide is obtained, titanium carbide accounts for about 4.5wt.%, the rest is titanium boride, titanium carbide is evenly distributed in the titanium boride matrix, and the density of the material is about 93 %.

Embodiment 2

[0026] The raw material is TiB with a particle size of 5000 mesh 2 Powder 90.0g, 800 mesh 3 AlC 2 10 grams of powder were ball-milled in an alcoholic medium for 12 hours, cold-pressed into a cake shape under a pressure of 5 MPa, and the cold-pressing time was 6 minutes. 15 °C / min heating rate to 1500 °C in situ reaction hot pressing for 1 hour, the hot pressing pressure is 30 MPa. Obtain a material composed of two phases of titanium boride and titanium carbide, titanium carbide accounts for about 9wt.%, the rest is titanium boride, titanium carbide is evenly distributed in the titanium boride matrix, and the density of the material is about 99% , the bending strength is 710.9±36.5MPa, the fracture toughness is 4.8±0.2MPa m 1 / 2 , the hardness is 25.1±0.7GPa, and the elastic modulus is 567GPa. The corresponding X-ray diffraction spectrum, the scanning electron microscope photo after corrosion and the morphology of the fracture are listed in figure 1 and Figure 2(a)-Figure...

Embodiment 3

[0028] The raw material is TiB with particle size of 1000 mesh 2 Powder 40 grams, 3000 mesh 3 AlC 2 10 grams of powder were ball-milled in an alcoholic medium for 30 hours, cold-pressed into a cake shape under a pressure of 20 MPa, and the cold-pressing time was 1 minute. In the process, the heating rate was raised to 1600° C. in situ for 1 hour at a heating rate of 10 / min, and the hot pressing pressure was 20 MPa. Obtain a material composed of titanium boride, titanium carbide and a small amount of titanium aluminum carbon three phases, titanium carbide accounts for 14wt.%, titanium aluminum carbon accounts for 3wt.%, the rest is titanium boride, titanium carbide and titanium aluminum carbon are evenly distributed In a titanium boride matrix, the material is about 99% dense.

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Abstract

The invention relates to the field of boride ceramics, and particularly provides a method for preparing a compact titanium diboride (TiB2) bulk material with ternary layered carbide titanium aluminum carbon (Ti3AlC2) as a sintering aid at a low temperature. By adopting the method of the invention, a problem that titanium diboride ceramic is difficult to sinter can be solved. The method comprises the steps of adopting TiB2 powder and Ti3AlC2 powder with different mass ratios as raw materials, mixing the raw materials for 5-40h through a physical mechanical method, cold pressing to a cake shapeat a pressure of 5-20Mpa, placing into a graphite mould and heating to 1400-1600 DEG C and reacting for 0.5-4h in situ at a pressure of 20-40MPa under the circumstance that an inert gas is introducedto serve as protective atmosphere. By adopting the method provided by the invention, the TiB2 ceramic material with excellent mechanical property can be synthetized at a low temperature.

Description

technical field [0001] The invention relates to the field of boride ceramics, and particularly provides a ternary layered carbide titanium aluminum carbon (Ti 3 AlC 2 ) as a sintering aid to prepare dense titanium diboride (TiB 2 ) method for bulk materials. Background technique [0002] Titanium diboride, as a transition metal boride, has high melting point, hardness and elastic modulus, good thermal and electrical conductivity, and good chemical stability. It can be used in high temperature structural materials, cutting tools, wear-resistant parts, conductive coatings, etc. However, due to its own structural characteristics and the surface characteristics of this type of powder, TiB 2 A higher densification temperature is required, which greatly limits the application of this material. Even if some non-metallic sintering aids are added, such as AlN, SiC, Si 3 N 4 etc., the sintering temperature is still generally higher than 1700 °C. Considering the ternary layered...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/63
Inventor 周延春郑丽雅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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