Durillium B - Tungsten Carbide
Durillium B is a compound that is applied by a thermal diffusion process into the surface of most carbon bearing steel alloys, tungsten carbide and refractory metals resulting in:
Durillium N - Carbide Nitride
Durillium N is applied as a diffusion process that significantly improves the wear and fatigue life of ferrous metals. Once applied, Durillium N forms an inner diffusion/transitional layer(approximately 0.015 in. thick) of nitrides and carbides that supports the outer surface layer.
Durillium B can be deposited to a depth of 0.001 in. to 0.01 in. with minimal dimensional change (typically 0.002 in for 0.0004 in. penetration). Durillium B will mirror the surface quality of its substrate and can be applied into a diamond polished surface. A Durillium B surface can be polished to within a light band of flatness and < 1 micro inch of roughness in order to reclaim the original surface quality. In addition, the surface demonstrates a surprising degree of lubricity.
Natural Color: Dark Gray
Thickness Range: < 0.0001 in. to 0.010 in.
Hardness (Vickers): Variable to 2200
Maximum Service Temperature: To > 2000° F Closed Mold; 1440° F Open Air
The Durillium B surface is brittle and will not withstand impact or shock. When installing Durillium B processed parts, do not us hammers, pry bars, screw drivers or other hard objects against the processed surface. Do not expose Durillium B processed parts to Nitric Acid.
Durillium B can be applied to many different types of components:
Durillium N is applied as a diffusion process, depending on the alloy, at temperatures between 850° F and 1075° F. Once applied, Durillium N forms an inner diffusion/transitional layer (approximately 0.015 in. thick) of nitrides and carbides that supports the outer surface layer. The outer layer (approximately 25 to 50 microns deep) is composed of epsilon nitrides and carbides of the constituent materials of the alloy. Because of the porosity of this outer layer, an affinity exists for most dry film lubricants or polymer topcoats useful in high load applications.
Treated parts often can be bent or formed without danger of distortion to the surface. Durillium N easily can be polished to "mirror back" the finish of the untreated part. Normal polishing procedures can return a diamond scale surface quality.