A method for six-sided diffusion welding of tantalum layer in tungsten block

Abstract

The invention discloses a method for welding tantalum layers to six faces of a tungsten block in a diffusion manner. The method comprises the steps that an outer wrapping sleeve is made of at least one of titanium, iron and molybdenum and is provided with a cavity for containing the tungsten block, spacer sheets and tantalum sheets are sequentially laid on the inner wall of the cavity, and then the tungsten block is placed in the cavity; tantalum sheets and spacer sheets are sequentially laid on the surface of the part, on the end face of the outer wrapping sleeve, of the tungsten block, metal sheets are used for covering, and electron beam welding is carried out on the metal sheets and the outer wrapping sleeve under the vacuum condition; then hot isostatic pressure diffusion welding is carried out; and the outer wrapping sleeve is removed after welding is finished. According to the method, the tantalum sheets and the tungsten block are located through the outer wrapping sleeve, the step of manufacturing a tantalum box through electron beam welding is omitted, no air suction material is needed for wrapping, the technology is simple, and cost is low. Due to the spacer sheets, after diffusion welding is finished, products can be taken out very conveniently, simpleness and easy operation are achieved, the requirement for efficiently producing tantalum-tungsten composite materials in a batch manner can be met, and a basis is laid for research and wide application of spallation neutron sources.

Description

technical field [0001] The application relates to the field of welding of refractory metals, in particular to a method for welding tantalum layers with tungsten blocks. Background technique [0002] The China Spallation Neutron Source is a major national science and technology infrastructure project. It is a tool to use neutrons to understand the microscopic world; Basic research and high-tech development research in the frontier fields of development and other disciplines provide a new and powerful large-scale scientific research platform. The China Spallation Neutron Source is the first spallation neutron source owned by a developing country. Together with the operating spallation neutron sources of the United States, Japan and the United Kingdom, it constitutes the world's four largest pulsed spallation neutron sources. [0003] The spallation neutron source uses tungsten as the target material. Because high-energy proton beams will generate a lot of heat when bombarding...

AI Technical Summary

Problems solved by technology

There are three deficiencies in this international general method: first, the difficulty of preparing the tantalum box by electron beam welding is relatively large, and after loading the tungsten block, when the tantalum sheet and the tantalum box are carried out electron beam welding to seal the tantalum box, the tantalum box must be sealed. It is also difficult to ensure that the space where the tungsten block in the tantalum box contacts is in a vacuum state to ensure the quality of the subsequent hot isostatic welding.

Second, there are many and complicated electron beam welding processes in the whole process, which makes the target components of tantalum-tungsten composite materials very expensive

Third, during hot isostatic pressing, it is necessary to wrap multiple layers of getter material outside the tantalum box. If the getter material is not wrapped, the surface of the tantalum will be oxidized and affect the quality

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