Connection method of tungsten alloy and molybdenum alloy
Tungsten metal is the highest melting point of the metal, its melting point up to 3422℃, the density of 19.3g/cm3, tungsten and tungsten alloy with high temperature strength, high elastic modulus, small thermal expansion coefficient, excellent chemical corrosion resistance, and good electron emission performance and other advantages. Therefore, tungsten and its alloys are widely used in aerospace, nuclear industry, weapons industry, power electronics and many other fields. With the development of industry and the progress of science and technology, people have found that molybdenum is a rare metal with very important strategic significance. Compared with tungsten, molybdenum has a low melting point and low density. Molybdenum and its alloys also have a series of excellent properties, such as high elastic modulus, low thermal expansion coefficient, superior high temperature creep properties, etc., so molybdenum and molybdenum alloys are widely used in machinery, chemical industry, national defense, electronics, aerospace and nuclear industry and other fields.
Tungsten and molybdenum are refractory metals, the application fields of both are very wide and the application field has a cross, in some specific occasions also involve tungsten and molybdenum connection problems. Electronic vacuum devices have a wide range of applications in the field of national defense and important communications and are known as the heart of modern information weapons and equipment. The hot cathode of the electronic vacuum device is composed of processed metal tungsten, and the sleeve in direct contact with the hot cathode is processed by molybdenum metal. In order to achieve the stability and life of the microwave tube, a reliable sealing connection must be achieved between the hot cathode and the sleeve. Therefore, the study of tungsten and molybdenum dissimilar metal connection not only has scientific research value, but also has very important significance in practical application. In recent years, some scholars hope to solve the problem of high temperature of tungsten and molybdenum diffusion welding by adding an intermediate layer.
