Method for preparing high-flatness pure-tungsten metal sheet

Abstract

The invention relates to a method for preparing a high-flatness pure-tungsten metal sheet. The method comprises the following steps of placing a pure-tungsten metal plate with a thickness of 0.1 to 0.4mm on a preheating roller mill for warm rolling, and rolling-milling the pure-tungsten metal plate until the deformation is 30 percent under the conditions of pressure of about 12T and speed of 200 to 600r / min, wherein a single feeding mode is adopted; uniformly dividing the rolled pure-tungsten metal plate along the length direction, and overlaying the uniformly-divided pure-tungsten metal plates along the thickness direction; performing subsequent warm rolling by adopting a double-layer overlaying feeding method, and rolling the pure-tungsten metal plates on the roller mill until the thickness of a single plate reaches a required thickness. According to the method, the number of intermediate annealing times is reduced, a production process is simplified, the rolling pressure and rolling passes are reduced, the energy consumption is effectively reduced, the production cost is lowered, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of pure tungsten metal processing, in particular to a method for preparing a high flatness pure tungsten metal thin plate. Background technique [0002] Due to its high melting point, high elastic modulus, good shock resistance and corrosion resistance, high electrical conductivity, thermal conductivity and excellent thermal fatigue resistance, and low expansion coefficient and other excellent properties, tungsten metal is widely used in medical treatment , metallurgy, electric light source, semiconductor device, high temperature structural parts and nuclear industry and other fields, among which the plate is the most widely used. In the field of medical CT collimator and detector. With the development of CT machines, the flatness requirements of collimators have been increased from less than 0.03 to less than 0.015, which poses new challenges to the preparation of pure tungsten thin materials. [0003] Th...

AI Technical Summary

Problems solved by technology

[0005] (1) For pure tungsten foils with a thickness less than or equal to 0.08mm, the billet produced by the traditional single-sheet rolling method has a poor difference in the same plate. In order to improve the flatness of the product, a higher leveling temperature is often required. The brittleness of the material increases, making it difficult to meet the performance requirements of the product

[0006] (2) The rolling deformation of pure tungsten is about 35%. Excessive deformation will easily lead to defects such as delamination and peeling

Occupies a large space: a large processing space is required, and each process needs to be isolated from each other

[0007] (3) Multiple annealing is required during rolling with large deformation, which increases the number of furnace passes, consumes a lot of energy, and has a long production cycle

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