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Preparation technique of no-hole high-density zirconium or zirconium alloy powder metallurgy special-form piece

A technology of powder metallurgy and preparation technology, applied in the field of material processing, which can solve the problems of low density, unevenness, flammability and inability to make density, etc.

Inactive Publication Date: 2009-08-19
李宝干
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Problems solved by technology

[0005] This process is used to form first and then dehydrogenate, which solves the problems that the powder is flammable after dehydrogenation, and the traditional powder metallurgy special-shaped parts cannot be formed, and the density is not uniform, and the density is not high. Excellent effect of no porosity and density greater than 98%

Method used

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Embodiment Construction

[0006] Process principle of the present invention is described in detail below:

[0007] The production of zirconium special-shaped products by powder metallurgy can solve the problems of low porosity and low density of special-shaped products, and at the same time improve the physical and mechanical properties of zirconium special-shaped products. However, there are three major difficulties in the production of zirconium powder metallurgy products: first, the powder is difficult to obtain; second, the forming pressure is relatively high, and the general hydraulic press cannot meet the requirements; third, it is difficult to control the vacuum sintering temperature. The present invention has basically solved the above-mentioned three major difficulties through many small batch tests and pilot tests, and has reached the expected goal. The process it adopts is implemented according to the following steps:

[0008] (1) Sponge zirconium hydrogenation: Sponge zirconium is made int...

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Abstract

The invention relates to a process for preparing a pore-free high-density zirconium or zirconium alloy powder metallurgical profile. The process mainly adopts sponge zirconium to process zirconium hydride powder with matched granularities of between 100 and 300 meshes, adopts a rubber die to shape, casts the material at isostatic pressure of between 260 and 350 MPa, dehydrogenates the material in vacuum, and sinters the material in a vacuum sintering furnace at a temperature of between 1,200 and 1,420 to reach the density of more than 98 percent. The zirconium or zirconium alloy powder metallurgical profile processed by the process has no pore and high density which indicate successful search on the item, and currently maintains the leading position at domestic.

Description

technical field [0001] The invention belongs to the technical field of material processing, in particular to the processing of special-shaped parts of non-ferrous metal materials. Background technique [0002] At present, it is well known that zirconium or zirconium alloy powder metallurgy products have the characteristics of high strength and corrosion resistance. They are mainly used in special-shaped parts produced in the chemical industry and nuclear industry. The main advantage is that they have stable physical, chemical and mechanical properties. The corrosion resistance is better than that of metal titanium, and it does not react with any concentration of organic and inorganic acids such as hydrochloric acid, nitric acid, acetic acid, and sulfuric acid with a concentration of less than 50% at a temperature of 150 degrees Celsius, and the aqueous alkali solution does not interact with zirconium. Corrosion occurs. However, in the actual application of zirconium materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F5/00
Inventor 李宝干
Owner 李宝干
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