Hi,
I am performing cross-section preparation of tungsten wires of diameters 345, 155, 64, 41 µm by mechanical grinding and polishing. I am using SiC foils of different grit sizes. For coarse grinding, 200 and 68 µm grit sizes foils are being used. For middle grinding, 30 and 18 µm foils while for pre-polishing 5 µm foils are being used.
I am having problem of broken edges and cracks in the wire cross-section and it seems that defects are grinding induced. Can anyone explain me why I am having defects? Any suggestion and literature are highly appreciated.
Regards,
Hassan
You may want to reconsider the specimen mounting technique ― not mentioned at the query enunciate. I would suggest to (previously) embed the titanium wire specimen in clear transparent acrylic resin, so that you can inspect the specimen trough the embedding resin. That may help with flexible wire.
Dear Hassan Saleem,
there are many types[1,2] of Tungsten wires (and filaments). So, what do you know about the specifications of your (as received) Tungsten wire(s) ?
1. http://www.made-in-china.com/products-search/hot-china-products/High_Purity_Tungsten_Wire.html
2. https://www.alibaba.com/showroom/tungsten-wire.html
Dear Carlos,
thanks for your efforts. I appreciate that.
Yes, the wires are embedded into epoxy resin with hardening agent. Wires are prepared in shape of spiral/coil. The problem is when it comes to mechanical grinding and polishing, it seems that grinding is inducing damages especially damaging the edges of the wire cross-section. I also have reduced the grit size and forces so not to wear the wire deliberately.
Dear Ioannis,
As recieved spec: 99.95% tungsten wire.
Thanks for your response.
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