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Preparation method for B4C-HfB2 high-temperature eutectic in-situ composite ceramic

A composite ceramic, b4c-hfb2 technology, applied in the field of B4C-HfB2 binary eutectic self-generated composite ceramics and its preparation, can solve the problems of high sintering temperature, long preparation cycle, etc., achieve uniform structure, short preparation cycle, eutectic small tissue effect

Active Publication Date: 2015-04-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the traditional solid-state sintering method requires a higher sintering temperature and a longer preparation cycle.

Method used

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  • Preparation method for B4C-HfB2 high-temperature eutectic in-situ composite ceramic
  • Preparation method for B4C-HfB2 high-temperature eutectic in-situ composite ceramic
  • Preparation method for B4C-HfB2 high-temperature eutectic in-situ composite ceramic

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Experimental program
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Effect test

Embodiment 1

[0028] This implementation case is a B 4 C-HfB 2 A method for preparing high-temperature eutectic self-generated composite ceramics.

[0029] The method is: using commercially available high-purity B 4 C and HfB 2 Powder, in molar ratio, where B 4 The molar content of C powder is 50%, HfB 2 The molar content of zirconia balls is 50%, using a polyethylene ball mill tank, and the zirconia balls are ball-milled at a speed of 300 rpm on a high-energy ball mill for 1 hour to obtain the required powder, and then the ball-milled powder is cooled at room temperature Isostatic pressing into a sheet with a diameter of 10mm and a height of about 5mm, put it into an arc melting furnace, and in an argon environment of 60kPa, the sample is rapidly melted by arc discharge, the output power is 20-40%, and the current It is 120-250A, and then the copper plate in the electric arc melting furnace is rapidly cooled to room temperature, and the water pressure is 0.06-0.07MPa.

[0030] tested...

Embodiment 2

[0032] This implementation case is a B 4 C-HfB 2 A method for preparing high-temperature eutectic self-generated composite ceramics.

[0033] The method is: using commercially available high-purity B 4 C and HfB 2 Powder, in molar ratio, where B 4 The molar content of C powder is 65%, HfB 2 The molar content is 35%, using polyethylene ball milling tank, zirconia balls are milled on a high-energy ball mill at a speed of 300 rpm for 1 hour to obtain the required powder, and then the powder after ball milling is uniformly cooled at room temperature Isostatic pressing into a sheet with a diameter of 10mm and a height of about 5mm, put it into an arc melting furnace, and in an argon environment of 60kPa, the sample is rapidly melted by arc discharge, the output power is 20-40%, and the current It is 120-250A, and then the copper plate in the electric arc melting furnace is rapidly cooled to room temperature, and the water pressure is 0.06-0.07MPa.

[0034] tested, see figure...

Embodiment 3

[0036] This embodiment is a B 4 C-HfB 2 A method for preparing high-temperature eutectic self-generated composite ceramics.

[0037] The method is: using commercially available high-purity B 4 C and HfB 2 Powder, in molar ratio, where B 4 The molar content of C powder is 78%, HfB 2 The molar content is 22%. A polyethylene ball mill tank is used. The zirconia balls are milled on a high-energy ball mill at a speed of 300 rpm for 1 hour to obtain the required powder. Isostatic pressing into a sheet with a diameter of 10mm and a height of about 5mm, put it into an arc melting furnace, and in an argon environment of 60kPa, the sample is rapidly melted by arc discharge, the output power is 20-40%, and the current It is 120-250A, and then the copper plate in the electric arc melting furnace is rapidly cooled to room temperature, and the water pressure is 0.06-0.07MPa.

[0038] tested, see figure 1 and Figure 4 , the B 4 C-HfB 2 The XRD patterns of high-temperature eutectic a...

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Abstract

The invention discloses a preparation method for B4C-HfB2 high-temperature eutectic in-situ composite ceramic. According to the invention, the proportion of boron carbide and hafnium boride is changed so as to prepare a uniformly distributed eutectic structure, wherein the molar content of hafnium boride is 10% to 50%. The preparation method comprises the following concrete steps: uniformly mixing boron carbide powder and hafnium boride powder, then pressing the mixed powder into a flake with a diameter of 10 mm at room temperature via cold isostatic pressing and preparing a B4C-HfB2 eutectic composite material by using an arc melting method. Compared with a traditional solid phase sintering method, the preparation method provided by the invention has the following advantages: the method is simple, a preparation cycle is short, and the prepared B4C-HfB2 composite ceramic has high density and more excellent high temperature performance. In addition, the composite ceramic has performance advantages of both HfB2 and B4C and can be used as an ultra-high temperature ceramic material.

Description

technical field [0001] The invention relates to the technical field of ultra-high temperature ceramic materials and their preparation, in particular to a B 4 C-HfB 2 Binary eutectic autogenous composite ceramics and a preparation method thereof. Background technique [0002] HfB 2 Belonging to transition metal borides, as an ultra-high temperature ceramic material, it has the characteristics of high melting point (3250 ° C), high hardness, good electrical and thermal conductivity, relatively good high temperature oxidation resistance and impact resistance, these excellent properties make it possible Used as high-temperature structural materials, such as: high-temperature electrodes, furnace components, rocket engines, and thermal protection systems for supersonic aircraft. However, a single hafnium boride material is difficult to sinter densely, and its own strength and toughness are relatively low, which limits its application in harsh environments. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/58C04B35/64
Inventor 涂溶李念李其仲章嵩张联盟
Owner WUHAN UNIV OF TECH
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