Preparation method for MoSi2 coating on surfaces of metal tantalum and alloy

Abstract

The invention discloses a preparation method for a MoSi2 coating on surfaces of metal tantalum and an alloy. The preparation method comprises the steps that S10, a tantalum substrate is provided, and the tantalum substrate is polished and cleaned to remove oxides and impurities on the surface of the tantalum substrate; S11, an osmotic agent raw material, which comprises an activator, a dispersant, molybdenum powder and silicon powder, is provided; S12, the molybdenum powder, the activator and the dispersant are mixed according to a mass part ratio of (40-50):(5-10):(40-55) to form a first mixture; S13, the tantalum substrate is buried in the first mixture, is subjected to heat preservation for 4-10 h at 1300-1500 DEG C in a protection atmosphere, and is taken out and cleaned; S14, the silicon powder, the activator and the dispersant are mixed according to a mass part ratio of (20-40):(5-18):(55-75) to form a second mixture; and S15, the product obtained in the step S13 is buried into the second mixture, is subjected to heat preservation for 8-20 h at 1100-1400 DEG C in the protection atmosphere, and is taken out and cleaned, so that a sample with the MoSi2 coating is obtained.

Description

technical field [0001] The invention relates to the field of alloy technology, in particular to a metal tantalum surface MoSi 2 Coating preparation method. Background technique [0002] Tantalum has excellent properties such as high density, high melting point, corrosion resistance, excellent high temperature strength, good processability and weldability, and low plastic / brittle transition temperature, so it is widely used in various industries such as electronics, chemical industry, and weapons. However, tantalum is in a stable state from room temperature to 300°C, and oxidizes and embrittles at 300°C. In order to solve the problem of tantalum oxidation, one is to start with the alloy itself and develop an alloy with high temperature oxidation resistance, such as Ta-10W. Antioxidant coating applied. So far, many studies have shown that the degree of alloying of tantalum is very small, because when the addition of alloying elements to improve the oxidation resistance incre...

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Problems solved by technology

The CVD method can prepare dense coatings, but the deposition efficiency is low; the thermal spraying method has high efficiency, but the coating is not dense and the operating environment is harsh; the slurry method and molten salt method coating composition and structure control are more complicated; The embedding method is favored because of its simple preparation process, firm combination of the coating and the substrate, compact structure and no restriction of the shape of the substrate material.

Preparation of MoSi on Tantalum Surface by Infiltration 2 The method of coating has not been reported at home and abroad

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