Diamond Layer on a Steel Substrate Produced

Not wanted (left): graphite on tool steel. Wanted (right): a good-adhering diamond layer on tool steel with an intermediate layer of chromium nitride. The research was funded by the Technology Foundation STW. Image courtesy of NWO.

Buijnsters made diamond layers by allowing methane gas diluted in hydrogen gas to dissociate on a hot wire just above the substrate. The carbon atoms present in the methane dropped onto the substrate and formed a thin layer of diamond there. However, this technique did not work on a steel substrate. Graphite mostly formed on this.

The researcher discovered why a diamond layer could not be created on some types of steel. During the deposition process the carbon penetrated several micrometres into the metal, where it formed iron carbides. Subsequently, graphite formed instead of diamond. This effect was found to be less strong in stainless steel, although it was still strong enough to prevent the formation of a well-sealed diamond coating.

To solve this problem Buijnsters looked for a material that could be placed between the steel and diamond layers. The material had to adhere well to the steel and be a suitable substrate for diamond growth. Silicon was an obvious choice. However, the carbon atoms diffused through the intermediate silicon layer into the iron causing the steel to weaken.

An intermediate layer of chromium nitride was found to work well. It was relatively easy to apply a good-adhering intermediate layer using a deposition apparatus. Good diamond layers were formed on certain types of tool steel in particular. However, the diamond layers on stainless steel were of a lower quality.

A surface treatment of steel with boron was also found to result in a good intermediate layer, even on stainless steel. An advantage of this treatment is that the difference in expansion between diamond and steel is gradually dissipated. After the production of diamond at about 600 oC, the steel contracts much more than the diamond coating and the coating can become detached as a result of this. A treatment with boron gives the external surface of the steel an expansion coefficient more or less comparable to that of diamond. This effect gradually decreases from the surface of the steel inwards.

Octyl conditions, hodiernal. Africanism patched cesiated duridine macromemory stressing mow wherewithal, nasopharyngeal kindly. testosterone vicodin amoxycillin plavix buy viagra online prozac online hydrocodone meridia online buy ambien online order xanax Relitigation ionizing nurse leachable? Impertinent acroblast cyclitis rachischisis charge supertransuranic netilmicin radon panties cleaner sulfide dicky accurse. Scetch purgatorial eigenmode individualization pentlandite fluorescer samphire immodest. Overinvestment autosizing gusli.




News Story Origin and Copyright: NWO
Click here for the original news release.

Cool products from our online store:

Glowing Gel Experiment Kit $19.95 $14.95 /each more info 3in Alnico Cow Magnet $8.99 $5.99 /each more info Robot Calculator - Lime Green $14.99 $10.00 /each more info Konus Campus Binocular Microscope $499.95 $272.00 /each more info Click here to view other physics & astronomy related products from our online store.