Breakage-preventing machining process for tungsten-base alloy wire rods

Abstract

The invention provides a breakage-preventing machining process for tungsten-base alloy wire rods. The breakage-preventing machining process comprises the steps of 1, stretching, wherein the unilateral stretching method is adopted for stretching the wire rods, the wire pouring-out operation is carried out before the next stretching process, and a wire end, pressed at the innermost part of a winding roll, of the last process is poured out and serves as a wire end of the next stretching process; 2, annealing, wherein the parabolic warming and cooling technology is adopted for annealing, the cooling curve is of a parabolic shape, and the temperature keeps constant for a period of time every one temperature gradient is lowered until annealing is finished. Experimental results show that the strength of tungsten-base alloy prepared through the breakage-preventing machining process for the tungsten-base alloy wire rods is greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of electron emission cathode materials, in particular to a tungsten-based alloy wire anti-fracture processing technology. Background technique [0002] Since the selection of electron emission cathode materials are all high-temperature refractory metals, the alloy has the following defects in the process of stretching and annealing: [0003] 1) When drawing, since the tungsten-based alloy wire needs to be stretched multiple times, the head and tail of the tungsten-based alloy wire will be repeatedly compressed, and it is very easy to generate cellulose disorder (such as dovetail shape) inside the alloy in the later stage. see figure 1 As shown, it seriously affects the physical properties of the product. [0004] 2) During annealing, in order to shorten the processing time, the rapid temperature rise and fall annealing is mainly used at present. During rapid annealing, the recrystallized grains in the...

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Problems solved by technology

[0003] 1) When drawing, since the tungsten-based alloy wire needs to be stretched multiple times, the head and tail of the tungsten-based alloy wire will be repeatedly compressed, and it is very easy to generate cellulose disorder (such as dovetail shape) inside the alloy in the later stage. see figure 1 As shown, seriously affect the physical properties of the product

[0004] 2) During annealing, in order to shorten the processing time, the rapid temperature rise and fall annealing is mainly used at present. During rapid annealing, the recrystallized grains in the internal structure of the alloy grow rapidly and penetrate, resulting in low strength of the alloy material, and there are products in the forming process. risk of fracture

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