Forging method for high purity niobium ingot used for radio frequency superconducting cavity

Abstract

The invention discloses a forging method for a high purity niobium ingot used for a radio frequency superconducting cavity. The forging method for the high purity niobium ingot used for the radio frequency superconducting cavity comprises the following steps that first, machining is conducted on the high purity niobium ingot used for the radio frequency superconducting cavity; second, the high purity niobium ingot is cut to obtain high purity niobium blank; third, vacuum annealing treatment is conducted on the high purity niobium blank; fourth, the high purity niobium blank is vertically placed on a lower hammer anvil of an oil hydraulic press, and multiple times of upsetting forging is conducted; fifth, the high purity niobium blank after upsetting forging is horizontally placed on the lower hammer anvil of the oil hydraulic press, and forging and pressing deformation is conducted by using an upper hammer anvil of the oil hydraulic press; sixth, shrinking tails at the ends of the high purity niobium forging blank are removed, and milling machining is conducted on the upper and lower surfaces of the high purity niobium forging blank; and seventh, vacuum annealing treatment is conducted on the high purity niobium forging blank to obtain the high purity niobium ingot. According to the forging method for the high purity niobium ingot used for the radio frequency superconducting cavity, machining of the high purity niobium ingot only by using a method of die forging blanking at present is broken through, relying on equipment of the high purity niobium forging technology is reduced, producing efficiency of the high purity niobium ingot is improved, introducing of impurity gap elements especially oxygen, nitrogen and hydrogen is reduced, and excessively fast reducing of residual resistance ratio of cast ingot is avoided.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a forging method of high-purity niobium ingots for radio frequency superconducting cavities. Background technique [0002] Particle accelerators are indispensable and important experimental devices in high-energy physics research. As an important part of the accelerator, the radio frequency superconducting cavity will directly affect the performance of the entire particle accelerator. High-purity niobium is the first choice material for making radio-frequency particle acceleration superconducting cavities, and its purity is the key to the performance of radio-frequency superconducting cavities. The superconducting resonant cavity made of high-purity metal niobium has the advantages of high acceleration gradient, small energy divergence, and long service life. In recent years, continuous breakthroughs in low-temperature superconducting technology have provided broad ...

AI Technical Summary

Problems solved by technology

[0004] Ingot forging is a necessary production link in the plastic processing of materials. Due to the small ingot shape of high-purity niobium ingots, die forging equipment with high material utilization rate, high processing precision, and continuous and controllable deformation process is usually used for blanking. However, Since the die forging method is limited by the capacity of the equipment, the weight of the forgings is mostly below 70kg, and the tonnage of the equipment is often at the level of 10,000 tons, so it cannot meet the requirements of mass production and technology promotion of high-purity niobium products

In addition, in the die forging method, the equipment forging die processing cycle is long, the cost is high, and the investment cost of equipment and tooling is also an important factor restricting the production of high-purity niobium.