Metallographic preparation - Part 5: Polishing with diamond pads and suspensions

Preparing your metallographic samples for microscopy at the ASC

[@moulichandumouli137]

Bro good work.. I have some queries for which materials, we have to use diamond polishing & alumina polishing.. pls explain

[@marcn8750]

Super. Thanks

[@Engineersoldinterstingstuff]

I do the opposite, grind on papers down to 2500-4000 range. Get much better edge retainment that way. Especially important for cast irons where soft cloths tend to erode the graphite. Generally its much faster to go on carbide papers and finnishing of by diamond. My way in general, 400, 800, 1500, 2500/4000 then 3 and 1 micron diamond suspension.

[@irfankhann9603]

hello sir...what kind of chemical should we use after grand sample....to take a clear image....i am working on laser cladding coating on cupper using Cr3C2-NiCr powder....

[@joehalliday6081]

Would you consider doing a custom episode related to a metalurgist that many suspect was the 1971 plane hijacker from Seattle to Portland that was never found? The FBI searched for 46 years and finally closed the case. The hijcker left behind a tie, presumably used in his metalurgy lab, and examination of it revealed dozens of rare metals, titanium alloyed to Antimony, titanium alloyed to aluminum, yttrium, palladium, lanthanum, and many many others. Your expertise would be very interesting to explore and perhaps you could recreate some of the methods used in the late 60s' and early 70's that could tell us more about the suspects. The two suspect metalurgists currently being investigated hold many patents that tell us a lot about their work and the metals they used. One of the metalurgists worked with plutunium/uranium to build the fat man bomb that was detontated over Japan to help end WWII in the pacific theater. The DB Cooper Mystery Group on Facebook has thousands of members and if you posted your interview there it could expand the interest in Metallography. Let me know what you think.

[@williamhuang5329]

Hanzhen harmonic drive gear , strain wave reducer ,robot joint , over 30 years experience

[@zms9603]

How the bubbles influence the polishing process? will it cause scratches?

[@CharlieSanabria]

No, they just sometimes shorten the life of the pads because they rip easier if the bubble catches a sharp edge of a puck

[@Thegeneralduct]

It also creates an uneven surface so the patent is essentially uneven at that point