A kind of mo-si-c alloy rod and preparation method thereof

Abstract

The invention discloses a Mo-Si-C alloy rod which is prepared from the following raw materials in atom percentage: 15-25% of silicon, 15-35% of carbon and the balance of molybdenum and inevitable impurities. The invention further discloses a method for preparing the Mo-Si-C alloy rod. The method comprises the following steps: I, performing ball milling on raw material powder, and drying so as to obtain mixed powder; II, pressing and molding the mixed powder so as to obtain a blank, and performing sintering treatment so as to obtain a Mo-Si-C alloy sintering body; III, smelting the Mo-Si-C alloy sintering body by using electronic beams so as to obtain Mo-Si-C alloy ingots, and cutting the ingots so as to obtain half-finished rods; and IV, smelting the half-finished rods in an electronic beam area, thereby obtaining the Mo-Si-C alloy rod. The Mo-Si-C alloy rod disclosed by the invention has the characteristics of high purity and low oxygen quality content, is very high in hardness and tension strength and excellent in fatigue resistance and high temperature strength, and has wide application prospects in super high temperature environments.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and in particular relates to a Mo-Si-C alloy rod and a preparation method thereof. Background technique [0002] With the development of aerospace technology and the improvement of flight distance and flight speed of various new aircraft, the engine is required to have a higher thrust-to-weight ratio and work efficiency. People have proposed more and more high-temperature structural materials with light weight, high strength and oxidation resistance high demands. However, the nickel-based superalloy used in existing engines is limited by its own melting point, and the upper limit of the service temperature is only 1100°C. Therefore, it is imperative to develop ultra-high temperature materials that can replace nickel-based superalloys. Molybdenum alloys have been extensively studied in the 1950s as candidate materials for aerospace, nuclear engineering and aircraft engines. Although m...

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Problems solved by technology

However, the poor high-temperature strength of these molybdenum alloy materials limits its application. This is due to the fact that the existing strengthening and toughening mechanisms of these materials are at high temperatures under the conditions of long-term dynamic thermal / mechanical coupling loading in ultra-high temperature environments. may have lost its usefulness in service

Therefore, although the high-temperature mechanical properties and fatigue strength of traditional molybdenum alloys can be improved to a certain extent through alloying modification, the prospect of greatly improving its mechanical properties and its application in the next generation of high thrust-to-weight ratio engines is limited.

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