Titanium-aluminum-based high temperature alloy block preparing method based on thermal explosion reaction

Abstract

The invention provides a titanium-aluminum-based high temperature alloy block preparing method based on a thermal explosion reaction. According to the titanium-aluminum-based high temperature alloy block preparing method based on the thermal explosion reaction, Ti / Al mixed powder is used as a raw material, an appropriate amount of titanium alloy powder is added to conduct alloying, a novel titanium-aluminum alloy material is prepared through the thermal explosion reaction and hot pressing sintering; compared with conventional gamma-TiAl, the novel titanium-aluminum alloy material remarkably improves indoor temperature ductility and has stable high temperature breaking strength and oxidation resistance at the temperature of 750 DEG C. Chinese weaponry urgently needs the high temperature titanium alloy material with the long-term working temperature capable of stably reaching 750 DEG C, such as high-pressure compressor blades, high-pressure compressor disks and high-pressure compressor casings, but the indoor temperature fragility of the existing gamma-TiAl material is too large. The novel titanium-aluminum alloy researched in the project basically keeps the heat resistance of the gamma-TiAl, but the novel titanium-aluminum alloy significantly lowers the indoor temperature fragility, greatly improves engineering practicability and embodies remarkable technology development, and then important technical support is provided for researching and manufacturing of heat-resistant components on aviation engines with thrust-weight ratio being 12-15 and high-performance aerospace thrusters.

Description

Technical field [0001] The invention is a method for preparing a titanium-aluminum-based high-temperature alloy block based on a thermal explosion reaction, and belongs to the technical field of thermal processing. Background technique [0002] γ-TiAl intermetallic compound has a series of advantages such as low density, high specific strength, high specific rigidity and good high temperature performance. It is generally considered that its long-term use temperature can even reach 750℃~800℃ (typical high temperature performance data: 800℃, tensile The tensile strength is about 500MPa). On the one hand, γ-TiAl intermetallic compounds can replace conventional Ti-based alloys, thereby increasing the use temperature of materials; on the other hand, it can replace Ni-based superalloys to achieve weight reduction, and the weight reduction effect is more obvious than that of Ti2AlNb alloys. This is very attractive for meeting the high-temperature service requirements and weight reducti...

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Problems solved by technology

[0005] It should be said that at present, there is a lack of a titanium-based superalloy in the field of aviation and aerospace in the world that can reach a long-term working temperature of 700°C to 750°C (room temperature elongation reaches 3.5% to 5.0%).

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