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Preparation method of ZrB2-ZrC-based ultrahigh-temperature-resistant ceramic

A high-temperature ceramic, zrb2-zrc technology, applied in the field of ceramic materials, can solve problems such as restricting popularization and application, and achieve the effects of reducing process temperature, improving material performance, and requiring less production equipment

Inactive Publication Date: 2013-04-24
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of the near-net-shape components of the reaction infiltration method, it has attracted widespread attention in recent years. There are reports in foreign literature that pure metal zirconium and 4 C powder reaction to prepare sheet-like toughened ceramic materials, but the process temperature is as high as 1900 ℃, which limits the popularization and application of this process

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  • Preparation method of ZrB2-ZrC-based ultrahigh-temperature-resistant ceramic
  • Preparation method of ZrB2-ZrC-based ultrahigh-temperature-resistant ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of ZrB by infiltration reaction of the present invention 2 -ZrC-based ultra-high temperature resistant ceramic method, including the following steps:

[0029] (1) Prepare the green body: weigh B with a mass ratio of 19:1 4 C powder and binder polycarbosilane, the weighed raw materials are mixed through a ball mill, the mixed powder is placed in a mold, and kept at 120°C for 6 hours, after being cross-linked and molded, a green body is obtained;

[0030] (2) Firing the porous rigid preform: the above-mentioned green body is cracked at a high temperature of 900°C under vacuum conditions and kept for 1 hour to obtain a porous rigid preform;

[0031] (3) Preparation of zirconium-containing alloy: take metal zirconium and metal copper with a mass ratio of 1:1 as main raw materials, and prepare zirconium-containing alloy through vacuum induction melting;

[0032] (4) Infiltration reaction: the porous rigid preform prepared above is used as the substrate, the zirconium-cont...

Embodiment 2

[0037] Preparation of ZrB by infiltration reaction of the present invention 2 -ZrC-based ultra-high temperature resistant ceramic method, including the following steps:

[0038] (1) Preparation of green body: weigh B with a mass ratio of 15:4:1 4 C powder, pore former flour and binder polycarbosilane, the weighed raw materials are mixed through a ball mill, and molded under a pressure of 100 MPa to obtain a green body;

[0039] (2) Firing the porous rigid preform: the above-mentioned green body is pyrolyzed at 1600°C under vacuum conditions, and the temperature is kept for 0.5h to obtain the porous rigid preform;

[0040] (3) Preparation of zirconium-containing alloy: take metal zirconium and metal copper with a mass ratio of 3:1 as main raw materials, and prepare zirconium-containing alloy by arc melting;

[0041] (4) Infiltration reaction: the porous rigid preform prepared above is used as the substrate, the zirconium-containing alloy is used as the infiltration agent, the substrate ...

Embodiment 3

[0045] Preparation of ZrB by infiltration reaction of the present invention 2 -ZrC-based ultra-high temperature resistant ceramic method, including the following steps:

[0046] (1) Preparation of green body: weigh B with a mass ratio of 5:1:1:3 4 C powder, filler SiC powder, pore former flour and binder polycarbosilane, the weighed raw materials are mixed through a ball mill, and molded under a pressure of 200 MPa to obtain a green body;

[0047] (2) Firing the porous rigid preform: the above-mentioned green body is pyrolyzed at 1600°C under vacuum conditions and kept for 1 hour to obtain the porous rigid preform;

[0048] (3) Preparation of zirconium-containing alloy: using metal zirconium and elemental silicon with a mass ratio of 97:3 as the main raw materials, through arc melting, the zirconium-containing alloy is prepared;

[0049] (4) Infiltration reaction: the porous rigid preform prepared above is used as the substrate, the zirconium-containing alloy is used as the infiltratio...

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Abstract

The invention discloses a preparation method of ZrB2-ZrC-based ultrahigh-temperature-resistant ceramic. The preparation method comprises the following process steps of: weighing raw materials, mixing by ball milling, and performing die pressing or crosslinking molding to obtain a green body; performing high-temperature cracking and heat preserving on the green body to obtain a porous rigid prefabricated body; undergoing an infiltration reaction by taking the porous rigid prefabricated body as a substrate and taking a zirconium-containing alloy as an infiltration agent to obtain semi-finished ZrB2-ZrC-based ultrahigh-temperature-resistant ceramic; and embedding the semi-finished ZrB2-ZrC-based ultrahigh-temperature-resistant ceramic with B4C powder or SiC powder and performing high-temperature treatment to obtain the ZrB2-ZrC-based ultrahigh-temperature-resistant ceramic. The process of the invention has the advantages of low preparation temperature and low cost. By adopting the preparation method, a ceramic product with high density, high mechanical property and high temperature resistance can be obtained.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a preparation method of an ultra-high temperature resistant ceramic matrix composite material. Background technique [0002] The aerospace field has extremely high requirements for materials such as high temperature resistance, ablation resistance, corrosion resistance, specific strength, specific stiffness, low density, and high toughness. Existing materials have shown limitations. In this context, the development of new materials with high strength, high modulus, and long-term physical and chemical stability in ultra-high temperature gas and oxidizing atmospheres has become a research hotspot in the field of materials at home and abroad. [0003] The high-temperature strength, oxidation resistance and thermal shock resistance of ultra-high temperature heat-resistant materials make them suitable for extreme environments including hypersonic long-duration flight, atmo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/56C04B35/622
Inventor 王松张守明李伟祝玉林向阳陈朝辉
Owner NAT UNIV OF DEFENSE TECH