Recent content by bilge

Please be careful. Many plastics contain low molecular weight polymers to improve the plastics viscoelastic behavior during processing. Over time, these can leave the plastic and coat some cooler surface. The best examples are the low-molecular weight vinyls in many automotive applications...

Wow! That's a new one. I'll be interested in the answer, too. My guess is that it is a nickel-chromium-molybdenum alloy. But would it be a superalloy or just a moly bearing stainless steel.

When you report the B/B temperature, make certain that you also report the criterion you used. There a number of different ones.

The magnitude of the residual stress can be reduced by heating because the maximum residual stree that can be locked in a body is the yield strength of the material. As you heat the body, the yield strength decrease and so will the residual stress. There have been reports that vibrations at...

You were, in a small way, lucky. Never, but never, use a diamond wheel to cut a ferrous product. The iron and the diamonds will react to form an iron-carbide. The wheel will be ruined. How do I know? I blush ... Use cubic boron nitride instead. (Why did the guys in the tool crib allow you...

Schweitzer says that titanium is "good" (corrosion less than 20 mils per yesr) in 90% hydrogen peroxide up to a temperature of 200 F.

Philip A. Schweitzer's book, "Corrosion Resistance Tables," has some data on the corrosion of a few stainless steels at a few Cl concentrations as a function of temperature. A better reference might be the ASM's Metal Handbook, volume 13, titles "Corrosion." It has a...

Schweitzer says less than 0.002 inches per year at room temperature.

It was invented in 1919 by a metallurgist named Stanley F. Rockwell. There is a library of technology at MIT (the Bitmer(?)) which might have the info you want. Then, again, you might want to check with the manufacturer, the Wilson Instrument Diivision of the American Chain and Cable Company...

Hard copy data is available in ASM International's Metals Handbook, Volume 2: Properties and Selection: Nonferrous Alloys. Many aluminum alloys are heat-treatable, so you generally need to know what condition (the pros call it "temper" designation) the alloy is in to know what its...

Have you considered cooling the assembly down, e.g. in liquid nitrogen or in dry-ice and alcohol, to see if the parts could be loosened?

Be careful in your selection of a metal to be next to wood. Wood is NOT a passive element. It gives off organic acids over time and the result can be devastating. A "museum of bullets" made its display cabinets out of wood only to find that all the lead cartriges soon formed a...

I would suggest a little experiment. Get one of the water filters used by back-packers (the "Katadhyn" sp? is best) which are used to filter out giardia and lung-worm cysts and see what if anything it picks up. Because of "static fatigue" in a water envirnoment, the glass...

The recommended weld metal would be ERCuAl-A2. Use a preheat of 150C. ButI prefer brazing, too.

Trethewey and Chanberlain in "Corrosion for Students of Science and Engineering," page 112, give the fre corrosion potential of Ni200 in sea water as -0.1 to -0.2 Vsce and that of Ag -0.1 to -0.15 Vsce.