Method for preparing high-flatness tungsten-nickel-iron alloy plate

Abstract

The invention relates to a method for preparing a high-flatness tungsten-nickel-iron alloy plate. The method comprises the following steps of pressing granulated and dried tungsten-nickel-iron alloy powder, and rolling the tungsten-nickel-iron alloy powder to obtain a tungsten-nickel-iron alloy green body with a thickness of 0.5 to 1.8mm and uniform density; placing the obtained tungsten-nickel-iron alloy green body into a sintering furnace, sintering the tungsten-nickel-iron alloy green body under the protection of hydrogen, and cold-rolling the sintered tungsten-nickel-iron alloy green body until the deformation reaches 40 percent; re-sintering the cold-rolled tungsten-nickel-iron alloy green body for 1 to 3 hours at the re-sintering temperature of 1,100 to 1,300 DEG C under the protection of hydrogen; repeating the former two steps until the thickness of the green body is smaller than 0.4mm; overlaying two tungsten-nickel-iron alloy plates with the thickness of 0.15mm, and rolling-milling the tungsten-nickel-iron alloy plates for about 25 times under the pressure of about 15T until the thickness of a single plate is less than 0.1mm. According to the method, a production process is simplified, the energy consumption is lowered, the production cost is reduced, and green production is ensured.

Description

technical field [0001] The invention belongs to the technical field of tungsten-nickel-iron alloy processing, in particular to a method for preparing a high-flatness tungsten-nickel-iron alloy plate. Background technique [0002] High-precision tungsten alloy devices are obtained through precision machining of tungsten-based high-density alloys, which are widely used in the fields of collimators and detectors for medical CT machines. With the development of CT machines, the flatness requirement of collimators has been increased from less than 0.03 to less than 0.02, which poses new challenges to the preparation of tungsten alloy thin materials. [0003] The existing main technologies for processing tungsten-nickel-iron alloy materials include the following: hot forging + cold forging treatment method, hot pressing + repressing finishing treatment method, hot rolling + repressing finishing treatment method, etc. There are many problems in these methods. The first problem inv...

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Problems solved by technology

There are many problems in these methods. The first problem involved is that the production cycle is too long. Generally, there are 2 to 3 production processes. Taking the production of tungsten-nickel-iron alloy sheets with a thickness of less than 1 mm as an example, the production cycle is at least 2 to 5 days; The second is high energy consumption: hot forging, hot rolling, annealing and other processes must use high-power high-temperature heating furnaces, which consume high energy consumption; third, the yield rate is low, and cracking and scrapping are easily generated during high-temperature processing to produce 1mm thick Take tungsten-nickel-iron alloy thin plate as an example, its comprehensive finished product rate is only about 50%; Fourth, the investment in equipment used is large, and there are many types and quantities, and most of them are processing equipment with high power and large tonnage, which require a large processing site, and tungsten Nickel-iron alloy foil material adopts the method of single sheet feeding and rolling

As the thickness of the material decreases during rolling, the total deformation of the material is limited, and the rolling force of the roll on the sheet during the rolling process is uneven, resulting in a large difference between the same sheet after the sheet is rolled, and the leveling Rolling defects such as double-sided waves, unilateral waves or medium-waves will be generated later, which will directly affect the flatness of the final product.

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