Low temperature sintered boride base ceramic materials and preparation method thereof

A ceramic material and low-temperature sintering technology, which is applied in the field of boride-based ceramic materials and their preparation, can solve the problems of low sintering density, high sintering temperature and pressure, and achieve excellent mechanical properties, lower sintering temperature, simple and practical process

Inactive Publication Date: 2009-04-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a low-temperature sintered boride-based ceramic material and its preparation method in order to solve the problems of high sintering temperature and pressure and low sintering density of boride-based ceramic materials in the prior art

Method used

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specific Embodiment approach 1

[0013] Embodiment 1: In this embodiment, the low-temperature sintered boride-based ceramic material is made of 60% to 94% boride powder, 5% to 30% silicon carbide powder and 1% to 10% additives by volume percentage. The additive is a mixed powder of alumina and yttrium oxide, and the molar ratio of alumina powder to yttrium oxide powder is 5:3.

[0014] The boride-based ceramic material of this embodiment has good density, a relative density of over 96%, a bending strength as high as 786MPa, and a fracture toughness as high as 7.12MPa 1 / 2 .

specific Embodiment approach 2

[0015] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the low-temperature sintered boride-based ceramic material consists of 68% to 87% of boride powder, 10% to 25% of silicon carbide powder and 3% by volume. Made with ~7% additives. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 1 in that the low-temperature sintered boride-based ceramic material is made of 75% boride powder, 20% silicon carbide powder and 5% additives by volume. Others are the same as in the first embodiment.

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Abstract

The invention relates to a low temperature sintering boride-based ceramic material and a preparation method thereof. The invention solves the problem of over high sintering temperature and pressure and low sintered density of the boride-based ceramic material in the prior art. The boride-based ceramic material is prepared by boride powders, carborundum powders and additives which are the mixture powders of alumina and yttria. The method is as follows: first, the boride powders, the carborundum powders and additives are mixed; second, the mixture is put in absolute ethyl alcohol for ultrasonic cleaning and dispersion, ball mill mixing and drying; and third, the mixture is cooled after hot-press sintering. The prepared low-temperature boride-based ceramic material after sintering at the condition of 1800 DEG C to 1850 DEG C and 30 Mpa are uniform and compact in structure, small in grain size and strong in mechanical property simultaneously, the relative density is above 96 percent and the intensity and toughness are respectively reach 786MPa and 7.12 MPam<1 / 2>. The method is simple and practical in technology, low in cost and easy for popularization.

Description

technical field [0001] The invention relates to a boride-based ceramic material and a preparation method thereof. Background technique [0002] Boride ceramic materials mainly include zirconium boride (ZrB 2 ) and hafnium boride (HfB 2 ). This kind of material not only has the characteristics of high melting point and high hardness, but also has excellent electrical conductivity, thermal conductivity, neutron control ability and chemical inertness with molten metal. It has a wide range of applications, and it is also expected to become one of the candidate materials for various key parts or components such as the next generation of new aircraft and engine hot ends. The performance characterization of boride ceramic materials and their structures in extreme environments such as high temperature and high overload, and the research on anti-oxidation and ablation behavior are the key technologies for the application of this material. The design and preparation of materials a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58
Inventor 张幸红韩杰才孟松鹤徐林韩文波胡平
Owner HARBIN INST OF TECH
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