A preparation method of titanium-aluminum-based superalloy bulk based on thermal explosion reaction

Abstract

The invention is a method for preparing a titanium-aluminum-based superalloy block based on a thermal explosion reaction. The method uses Ti / Al mixed powder as a raw material, and adds an appropriate amount of titanium alloy powder for alloying. Sintering to prepare a new type of titanium-aluminum alloy material will significantly increase the elongation at room temperature compared with conventional ‑TiAl, and at the same time have stable high-temperature fracture strength and oxidation resistance at 750 °C. my country's weapons and equipment have an urgent demand for high-temperature titanium alloy materials that can stably reach 750 °C for a long-term working temperature, such as high-pressure compressor blades, high-pressure compressor disks and casings, etc., but the existing ‑TiAl materials are too brittle at room temperature. The new titanium-aluminum alloy studied in this project will basically retain the thermal strength of ‑TiAl, but will significantly reduce its room temperature brittleness, significantly improve its engineering practicability, and reflect significant technological progress. Provide important technical support for the development of heat-resistant components on aerospace thrusters.

Description

technical field [0001] The invention relates to a preparation method of a titanium-aluminum-based superalloy block based on thermal explosion reaction, and belongs to the technical field of thermal processing. Background technique [0002] γ-TiAl intermetallic compounds have a series of advantages such as low density, high specific strength, specific stiffness, and good high temperature performance. The tensile strength is about 500MPa). On the one hand, γ-TiAl intermetallic compounds can replace conventional Ti-based alloys, thereby increasing the service temperature of materials; on the other hand, they can replace Ni-based superalloys to achieve weight reduction, and the weight reduction effect is more obvious than Ti2AlNb alloys , which is very attractive to meet the high-temperature service requirements and weight reduction requirements of high-performance aero-engines. [0003] However, the biggest problem of γ-TiAl intermetallic compounds is the poor plasticity at r...

AI Technical Summary

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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