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Generation and Control of Splits in Tungsten Wires

Author: ZhangGuoQin
Tutor: LuGuiMin
School: Northeastern University
Course: Materials Engineering
Keywords: Wolfram Crack Rotary Hammer Fibrous tissue Temperature
CLC: TG356
Type: Master's thesis
Year: 2008
Downloads: 49
Quote: 0
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Abstract


This thesis, in-depth study the cause of the cracks in the tungsten pressure processing and control methods , to clear the # 2 rotary hammer and subsequent drawing process for high-performance tungsten quality , and to determine the tungsten rotary hammer and wire drawing process critical process parameters to improve the quality of the tungsten . # 2 rotary hammer brushed the last step before a turning point of the rod material and wire processing point , the rotary hammer after the organization of the material structure and performance of the the tungsten filament end product quality and performance are important , therefore, of this process should be taken seriously enough . Influence of temperature on the surface quality of the rotary hammer is mainly in the degree of oxidation of the surface of the material after processing , as well as due to temperature fluctuations caused by the material homogeneous change . Studies have shown that for the HW61 material , each pass in turn 2 # rotary hammer process using 1300 ° C and 1280 ° C , 1230 ° C and 1180 ℃ can get better performance , process should always measure the processing temperature to ensure that the processing temperature stability, while , the processing temperature can not be too high, in order to ensure the effect of the graphite emulsion coating also, should be noted that the equalization of the heating atmosphere in the processing , to prevent oxidizing atmosphere caused by the oxidation of the material . Graphite drawing process milk and drawing die wire crack is also crucial . The study found that S - 1B model S brand graphite milk suitable for single-mode wire drawing , while applicable to multimode brushed the G card graphite milk , with some improvement of the quality of the wire flaw A feed rate than normal rise 5 percentage points or so. Mold compression angle according to the processing of specific process to determine the size of the angle , the diameter of the wire , compression ratio , drawing speed and other factors related to under the current process using 12-14 . The angle it to better adapt the of Φ1.0mm vertical thick wire segment processing , and to reduce the generation of cracks . In summary , through strict process control , can greatly improve the quality of the tungsten wire , you can create a good economic and social benefits .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Drawing, drawing > Drawn,the drawing process
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