Featured Research

from universities, journals, and other organizations

Diamond Layer Makes Steel Rock Hard

Date:
May 19, 2003
Source:
Netherlands Organization For Scientific Research
Summary:
Dutch chemist Ivan Buijnsters from the University of Nijmegen has successfully produced a diamond layer on a steel substrate. This opens up the possibility of wear-resistant tools. The secret to this technique is an adhesive layer between the steel and the diamond layer.

Dutch chemist Ivan Buijnsters from the University of Nijmegen has successfully produced a diamond layer on a steel substrate. This opens up the possibility of wear-resistant tools. The secret to this technique is an adhesive layer between the steel and the diamond layer.

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.


Story Source:

The above story is based on materials provided by Netherlands Organization For Scientific Research. Note: Materials may be edited for content and length.


Cite This Page:

Netherlands Organization For Scientific Research. "Diamond Layer Makes Steel Rock Hard." ScienceDaily. ScienceDaily, 19 May 2003. <www.sciencedaily.com/releases/2003/05/030519083003.htm>.
Netherlands Organization For Scientific Research. (2003, May 19). Diamond Layer Makes Steel Rock Hard. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2003/05/030519083003.htm
Netherlands Organization For Scientific Research. "Diamond Layer Makes Steel Rock Hard." ScienceDaily. www.sciencedaily.com/releases/2003/05/030519083003.htm (accessed September 23, 2014).

Share This



More Matter & Energy News

Tuesday, September 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Company Copies Keys From Photos

Company Copies Keys From Photos

Newsy (Sep. 22, 2014) A new company allows customers to make copies of keys by simply uploading a couple of photos. But could it also be great for thieves? Video provided by Newsy
Powered by NewsLook.com
Rockefeller Oil Heirs Switching To Clean Energy

Rockefeller Oil Heirs Switching To Clean Energy

Newsy (Sep. 22, 2014) The Rockefellers — heirs to an oil fortune that made the family name a symbol of American wealth — are switching from fossil fuels to clean energy. Video provided by Newsy
Powered by NewsLook.com
Raw: SpaceX Rocket Carries 3-D Printer to Space

Raw: SpaceX Rocket Carries 3-D Printer to Space

AP (Sep. 22, 2014) A SpaceX Rocket launched from Cape Canaveral, carrying a custom-built 3-D printer into space. NASA envisions astronauts one day using the printer to make their own spare parts. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Inside London's Massive Sewer Tunnel Project

Inside London's Massive Sewer Tunnel Project

AP (Sep. 22, 2014) Billions of dollars are being spent on a massive super sewer to take away London's vast output of waste, which is endangering the River Thames. (Sept. 22) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins