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Zirconium diboride and short carbon fiber modified thermal shock resistant and ablation resistant SiBCN ceramic material and preparation method thereof

A technology of short carbon fiber and ceramic materials, which is applied in the field of SiBCN ceramic materials and its preparation, can solve the problems of poor thermal shock resistance and ablation resistance, and achieve the effects of improved thermal shock resistance, extended crack propagation path, and excellent mechanical properties

Active Publication Date: 2018-10-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor thermal shock resistance and ablation resistance of existing SiBCN ceramics under high temperature service environment, and provide a thermal shock resistance and ablation resistance SiBCN ceramic material modified by zirconium diboride and short carbon fibers and its preparation method

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  • Zirconium diboride and short carbon fiber modified thermal shock resistant and ablation resistant SiBCN ceramic material and preparation method thereof
  • Zirconium diboride and short carbon fiber modified thermal shock resistant and ablation resistant SiBCN ceramic material and preparation method thereof
  • Zirconium diboride and short carbon fiber modified thermal shock resistant and ablation resistant SiBCN ceramic material and preparation method thereof

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specific Embodiment approach 1

[0033] Specific embodiment 1: The thermal shock-resistant and ablation-resistant SiBCN ceramic material modified by zirconium diboride and short carbon fiber in this embodiment is composed of SiBCN, short carbon fiber and ZrB 2 Composite; the volume fraction of short carbon fibers in the thermal shock-resistant and ablation-resistant SiBCN ceramic material is 5-10vol%, ZrB 2 The mass fraction is 10-30 wt%, and the balance is SiBCN.

[0034] The principles and beneficial effects of this embodiment are:

[0035] 1. The thermal shock-resistant and ablation-resistant SiBCN ceramic material modified by zirconium diboride and short carbon fibers in this embodiment has excellent mechanical properties, thermal shock resistance and ablation resistance. Among them, the mechanical properties of materials can be developed through different structures and C f (short carbon fiber) is introduced to design, and its main strengthening mechanism is through the developed BN(C) sheet and short ...

specific Embodiment approach 2

[0038] Embodiment 2: This embodiment is different from Embodiment 1 in that: the length of the short carbon fibers is 1-2 mm; the diameter is 5-8 μm. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: The preparation method of the thermal shock-resistant and ablation-resistant SiBCN ceramic material modified by zirconium diboride and short carbon fiber in this embodiment is carried out according to the following steps:

[0040] Step 1: Add silicon powder, graphite powder, hexagonal boron nitride powder and zirconium diboride powder into a high-energy ball mill, and conduct ball milling under the protection of argon to obtain nano-SiBCN-ZrB 2 powder;

[0041] The mol ratio of silicon powder, graphite powder and hexagonal boron nitride powder described in step one is 4: (5~7): (1~3), the total mass of silicon powder, graphite powder and hexagonal boron nitride powder and diboron The mass ratio of zirconium powder is: 1:(0.1~0.3);

[0042] Step 2: Nano-SiBCN-ZrB 2 The powder is mixed with short carbon fibers, placed in absolute ethanol for ultrasonic dispersion for 15-30 minutes, and then ball milled to obtain ceramic slurry;

[0043] Step ...

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Abstract

The invention discloses a zirconium diboride and short carbon fiber modified thermal shock resistant and ablation resistant SiBCN ceramic material and a preparation method thereof, and relates to a SiBCN ceramic material and a preparation method thereof. The invention aims to solve the problem of poor thermal shock resistance and poor ablation resistance of SiBCN ceramic at present. The SiBCN ceramic material disclosed by the invention is prepared by compounding SiBCN, short carbon fiber and ZrB2. The preparation method comprises the following steps: performing ball milling of silica powder, graphite powder, hexagonal boron nitride powder and zirconium diboride powder to obtain nano SiBCN-ZrB2 powder; compounding the SiBCN-ZrB2 powder with short carbon fiber, then performing dispersion andball milling to obtain ceramic slurry; finally, drying, levigating and sintering in turn to finish the preparation. According to the preparation method disclosed by the invention, by modifying SiBCNwith ZrB2 and Cf, the prepared SiBCN ceramic has excellent thermal shock resistance and ablation resistance, and the temperature interval of high-temperature service of the SiBCN ceramic material is expanded. The preparation method disclosed by the invention is suitable for preparing SiBCN ceramic.

Description

technical field [0001] The invention belongs to the technical field of high-temperature structural ceramic materials, and in particular relates to a SiBCN ceramic material and a preparation method thereof. Background technique [0002] SiBCN high-temperature ceramics have attracted much attention because of their excellent thermal stability in non-oxidizing environments, and they still maintain an amorphous state at 1800 ° C to 2000 ° C. Studies have shown that the high temperature thermal shock resistance and oxidation resistance of SiBCN ceramics are even better than traditional structural ceramics. The traditional preparation method is to prepare SiBCN ceramics by precursor cracking, but the precursor cracking method is complicated in process and expensive in raw materials; Dense ceramics are produced. In order to avoid the above limitations, silicon powder, graphite powder and hexagonal boron nitride powder were used as raw materials to obtain amorphous SiBCN ceramic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/58
CPCC04B35/806C04B35/58C04B2235/3813C04B2235/386C04B2235/425C04B2235/428C04B2235/5248C04B2235/666C04B2235/96
Inventor 贾德昌廖宁杨治华周玉段小明何培刚蔡德龙
Owner HARBIN INST OF TECH
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