Textured boride base ultra-high temperature ceramic material and its preparation method

An ultra-high temperature ceramic and boride technology, which is applied in the field of textured boride-based ultra-high temperature ceramic materials and its preparation, can solve the problem of low mechanical properties of boride-based ceramics, and achieve improved performance, obvious thermal conductivity, high The effect of the degree of texture

Inactive Publication Date: 2012-10-17
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low mechanical properties of boride-based ceramics in the prior art, the present invention provides a textured

Method used

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  • Textured boride base ultra-high temperature ceramic material and its preparation method
  • Textured boride base ultra-high temperature ceramic material and its preparation method
  • Textured boride base ultra-high temperature ceramic material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] For the preparation of ZrB 2 -5mol%MoSi 2 Composite ceramics, weighing 45.612 grams of Zr powder, 10.811 grams of B powder, 2.399 grams of Mo powder and 1.404 grams of Si powder.

[0038] With acetone as solvent, at a speed of 560 rpm, with ZrO 2 The balls and planets were milled for 8 hours, and the resulting slurry was dried by rotary evaporation to obtain a uniformly mixed powder.

[0039] Put the uniformly mixed powder in a graphite mold (37mm×30mm) coated with BN on the inner wall surface, and carry out reaction hot pressing sintering in vacuum: the heating rate during sintering is 10°C / min, and the temperature is raised to 1550°C and kept for 30 minutes , and then apply a pressure of 20 MPa, while raising the temperature to 1800° C. at a heating rate of 10° C. / min and keep it warm for 1 hour.

[0040] Cut the sample prepared by reactive hot pressing sintering (40mm×30mm×9.8mm before cutting, 20mm×15mm×9.8mm after cutting), and then place it in a graphite mold (...

Embodiment 2

[0043] For the preparation of ZrB 2 -19mol% MoSi 2 Composite ceramics, weighing 45.612 grams of Zr powder, 10.811 grams of B powder, 9.114 grams of Mo powder and 5.336 grams of Si powder.

[0044] The powder was prepared in the same manner as in Example 1, sintered by reactive hot pressing and hot forged.

[0045] The relative density of the sample after hot forging is 98.9%. The Lotgering orientation factors f(00l) of samples before and after hot forging were 0.12 (before hot forging), 0.59 (bidirectional compression hot forging), and 0.64 (unidirectional compression hot forging). Bending strength of the sample before hot forging: vertical to the hot forging direction, 595MPa; parallel to the hot forging direction, 531MPa. The bending strength of the sample after bidirectional compression hot forging: vertical hot forging direction, 845MPa; parallel hot forging direction, 691MPa. The bending strength of the sample after unidirectional compression hot forging: perpendicula...

Embodiment 3

[0047] For the preparation of ZrB 2 -50mol% MoSi 2 Composite ceramics, weighing 45.612 grams of Zr powder, 10.811 grams of B powder, 23.985 grams of Mo powder and 14.043 grams of Si powder.

[0048] The powder was prepared in the same manner as in Example 1, sintered by reactive hot pressing and hot forged.

[0049] The relative density of the sample after hot forging is 99.5%. The Lotgering orientation factors f(00l) of samples before and after hot forging were 0.16 (before hot forging), 0.70 (bidirectional compression hot forging), and 0.73 (unidirectional compression hot forging). Bending strength of the sample before hot forging: vertical to the hot forging direction, 520MPa; parallel to the hot forging direction, 467MPa. The bending strength of the sample after bidirectional compression hot forging: vertical hot forging direction, 789MPa; parallel hot forging direction, 659MPa. The bending strength of the sample after unidirectional compression hot forging: perpendicu...

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Abstract

The invention discloses a textured boride base ultra-high temperature ceramic material and its preparation method. The ceramic material is a boride-silicide base composite material and is prepared from raw materials of group IVB metal, boron, silicon and transition metal. In addition, the microstructure of the composite material contains boride crystal grains of anisotropic grain growth and directional arrangement. The ceramic material is prepared by the following steps of: firstly performing reactive hot-pressing sintering to prepare densified boride base ceramic with the anisotropy crystal grain microstructure, and carrying out microstructure modulation on the ceramic which has undergone reactive hot-pressing sintering by a hot forging method to realize directional arrangement of the crystal grains of anisotropic grain growth. Therefore, the textured boride base ultra-high temperature ceramic material with the anisotropic grain growth crystal grain microstructure is obtained. According to the invention, relative density of the obtained ceramic material is greater than 98%; Lotgering orientation factor f (001) can reach up to 0.91; and its oxidation resistance, thermal conductivity and other properties all show obvious anisotropy.

Description

technical field [0001] The invention relates to a textured boride-based ultra-high temperature ceramic material and a preparation method thereof, in particular to a textured boride-based ultra-high temperature ceramic material with anisotropic grain morphology and a preparation method thereof The invention belongs to the technical field of boride-based ceramic materials. Background technique [0002] Ultra-high-temperature ceramics refer to those transition metal borides, carbides and nitrides that can be used above 1800°C and in a reactive atmosphere, and have excellent high-temperature oxidation resistance and thermal shock resistance. Transition metal boride MB 2 (M=Ti, Zr, Hf) has become an important candidate material for ultra-high temperature ceramics due to its high melting point (>3000 ° C), high hardness and good thermal conductivity, and is expected to be used as a high-temperature heat-resistant component in the industrial field ( J. Am. Ceram. Soc., 90 [5] ...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 张国军刘海涛阚艳梅
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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