Tantalum tungsten alloy is a kind of alloy formed by adding a certain amount of tungsten element on tantalum matrix. Although tantalum and tungsten are both infinitely solid soluble, when the tungsten content exceeds 12at% -14at %, the plasticity of the alloy will be significantly reduced, when the tungsten content is low, tantalum tungsten alloy not only maintains the low temperature plasticity of pure tantalum, but also has high strength, oxidation resistance and corrosion resistance, so the tantalum tungsten alloy with lower tungsten content is widely used in aviation, aerospace, chemical industry, nuclear industry and other fields.
The preparation of tantalum tungsten alloy blank usually needs to go through several processes such as mixing, compact, sintering, melting, etc., but at present, the tantalum tungsten alloy sheet produced by tantalum is not uniform, the alloy has large grain size and poor mechanical properties, resulting in a low yield.
Tantalum tungsten powder is fully mixed by high-energy ball mill, tantalum tungsten billet is fully broken and mixed, and then billet particles are screened by screening machine to obtain uniformly textured billet particles, so that the structure distribution of tantalum tungsten alloy plate is more uniform, and the finished product rate of tantalum tungsten alloy sheet processing is improved. Meanwhile, hot pressing can make the tantalum tungsten alloy sheet compact and improve its mechanical properties. The yield point of the tantalum tungsten alloy sheet is increased by three times of cold rolling, and the residual stress of the tantalum tungsten alloy plate is eliminated by four times of annealing, so as to avoid deformation and cracks in the future cutting of the tantalum tungsten alloy sheet.
Mixing of raw materials, tantalum powder with an average particle size of 3μm ~ 5μm and tungsten powder with an average particle size of 3μm are used as raw materials, and then the two are mixed in a certain required ratio, and then the mixed tantalum and tungsten powder are fully mixed in a high-energy ball mill to obtain mixed powder;
Compact, the mixed powder is placed on the hydraulic press for pressing, pressing pressure is 300MPa ~ 450MPa, to obtain the billet;
The billet is broken, and the billet is crushed again in the high-energy ball mill to obtain billet particles;
Billet screening: the billet particles are put into the screening machine for screening, and the uniformly textured billet particles are obtained;
In arc melting, the billet particles are put into the crucible of the arc melting furnace, and the vacuum is stopped when the pressure in the furnace is lower than 0.003Pa, and then the vacuum is withdrawn after high purity argon is filled to 0.05MPa. The above vacuum steps are repeated three times before melting to obtain tantalum tungsten alloy billet.
Forging rolling, the tantalum tungsten alloy blank is hot rolled, vacuum annealed and then cold rolled for three times to get the tantalum tungsten alloy sheet.
