The invention relates to a tungsten rhenium molybdenum alloy rotating anode target for X-ray tube and a preparation method thereof, belonging to the technical field of powder metallurgy. The X-ray tube uses tungsten-rhenium molybdenum alloy rotating anode target, including tungsten-rhenium alloy layer and molybdenum alloy layer, with tungsten-rhenium pre-alloy powder and molybdenum alloy powder as raw material, successively by molding, high temperature sintering, hot isostatic pressing, straightening-shaping, machining process preparation. The tungsten-rhenium molybdenum alloy prepared by the invention has fine grain size, uniform structure, low content of impurity elements, high density, high strength and other excellent performance; The rotating anode target for X-ray tube made of tungsten-rhenium molybdenum alloy has the advantages of high qualified rate, good heat dissipation, good heat impact resistance and long service life.
X-ray tubes emit X-rays by directly bombarding high-energy electron beams with a rotating anode surface, with local temperatures up to 2600 °C. Tungsten is usually used as a target-surface material because of its high melting point, high high temperature strength, good heat dissipation performance, high atomic number, and strong X-ray excitation under electron beam bombardment. However, because the X-ray tube is intermittent work, sometimes hot and sometimes cold, the target surface material is easy to crack, and tungsten has a sensitive effect of notch, easy to lead to crack expansion, deepening, peel from the matrix, damage the X-ray tube. A small amount of precious metals such as rhenium or other transition group elements with high melting point and high atomic number are added to tungsten to form tungsten alloy as target surface material. Compared with pure tungsten target surface layer, tungsten alloy has better resistance to melting loss, prevents the target surface from cracking, ensures clear imaging and improves the service life of X-ray tube. At present, it is commonly used as the matrix material. With the same diameter, the weight of mo-based tungsten target is about 1/2 lower than that of pure tungsten target, while the heat capacity of mo-based tungsten target with the same weight is more than two times higher than that of pure tungsten target, which increases the output power of the target.
A tungsten - rhenium - molybdenum alloy rotating anode target for X-ray tube and a preparation method thereof are provided. The tungsten-rhenium-molybdenum alloy target obtained by the preparation method of the invention has the advantages of fine and uniform grain texture, low content of impurity elements, high product density, high bonding strength of tungsten-rhenium-molybdenum alloy layer, high qualified rate of the product, good heat dissipation, good heat shock resistance and long service life, etc.
