Superbti is a professional company supplying high performance titanium bars, wire, plates, forgings, tubes and fasteners.

From the heat permeability expansion, electroplating, such as vacuum coating processing technology, the traditional surface strengthening, wear-resisting development to the present stage to plasma permeability, the application of ion beam, electron beam, laser beam marked by modern surface treatment technology, such as surface nitriding, gas nitriding, plasma nitriding, surface seepage element alloying, laser cladding, etc. At present, the titanium and titanium alloy surface strengthening technology is moving toward a variety of surface technology comprehensive application and research of multilayer composite coatings preparation direction.

Titanium alloy carburizing TiC phase is generated on the surface, has the very high hardness. But the adhesion strength of the TiC layer and substrate is very poor, interfere with the actual use. High temperature can make titanium carbide grain growth speed:

The sintering temperature. Titanium carbide high manganese steel bonded carbide final sintering temperature generally take 1420 ℃ more appropriate. The sintering temperature is unfavorable and exorbitant. Even make binding phase liquid metal loss and adjacency, aggregation and grew up in the hard phase, fractured formation source. This is the analysis of grain size of hard phase in front of the bonding between the phase changes little. Sintering temperature, of course, also cannot too low, otherwise it will make the alloy owe to burn, especially the degumming, reduction and liquid phase sintering in three stages.

During sintering, the heating speed. This kind of alloy sintering temperature when heating should not be fast to strictly control the heating rate and holding time. Because in the low temperature degumming phase, compact release stress and forming process of volatile, if warming faster, by forming agent and steam to volatilize and liquefaction, make compact burst or micro crack phenomenon; Above 900 ℃ reduction stage, to make compact have enough time to take off all use the raw material powder (such as Mn2Fe intermediate alloy) in volatiles and oxygen; Into the liquid phase sintering stage, also want to heat up a little slower talents make compact fully alloying.

Titanium will at high temperatures and oxygen, nitrogen and other gases, cause hardening, high temperature (800-900 degrees) nitride processing, make its surface vickers hardness up to more than 700;By surfacing welding, with the right amount in the argon gas nitrogen or oxygen, make its surface hardness can be improved 2-3 times; Through ion plating, make its surface generates a titanium nitride layer, the thickness of the 5 microns, vickers hardness on the surface of a whopping 16000-20000;Chrome plating, etc. When nitriding may form a variety of different area, if you don't high oxygen content, form the outer zone of titanium nitride, with golden color and hardness of 14000-14000 MPa, but this kind of titanium nitride layer is fu due to the low temperature or nitride and high temperature heated (annealing), nitrogen is completely dissolved into the titanium metal on the surface of the solid solution, titanium intensified layer no longer increases or disappear in a heat treatment process, therefore, the discovery of titanium nitride layer when ti solid solution have dissolved into nitrogen the layer with high hardness, but the core hardness decrease. When using nitriding of ammonia, due to the effect of hydrogen permeation and additional organizational change. Titanium nitride hard and conductive titanium nitride heat generated more than all of the titanium oxide. Therefore also must pay attention to, under the condition of complete removal of oxygen for nitriding processing. Titanium surface will react with nitrogen in time according to the parabola law. Therefore, nitriding rate increased with the increase of nitriding time reduction. Because nitrogen out of the titanium nitride layer diffusion velocity is less than the following Ti solid solution of the diffusion velocity of body, and impossible to form a thick nitride layer, nitrogen or ammonia must have a high purity. Because oxygen not only hinder the formation of the nitride layer, but also can produce surface layer under the condition of relatively high temperature to remove oxide skin, the content of moisture (humidity) must be at least to such a degree, even to melting point.