Coatings titanium carbide

Fig. 14. Titanium carbide coating on graphite showing the nodular growth with a columnar morphology and the fracturing resulting from a coefficient of...

Titanium carbide is resistant to aqueous alkaU except in the presence of oxidising agents. It is resistant to acids except nitric acid, aqua regia, and mixtures of nitric acid with sulfuric or hydrofluoric acid. In oxygen at 450°C, a nonprotecting anatase coating forms. The reaction... 

Titanium carbide may also be made by the reaction at high temperature of titanium with carbon titanium tetrachloride with organic compounds such as methane, chloroform, or poly(vinyl chloride) titanium disulfide [12039-13-3] with carbon organotitanates with carbon precursor polymers (31) and titanium tetrachloride with hydrogen and carbon monoxide. Much of this work is directed toward the production of ultrafine (<1 jim) powders. The reaction of titanium tetrachloride with a hydrocarbon-hydrogen mixture at ca 1000°C is used for the chemical vapor deposition (CVD) of thin carbide films used in wear-resistant coatings. 

Ceramic-coated disposable inserts, including silicon nitride, boron nitride, titanium nitride (TIN), titanium carbide (TIC) and sintered synthetic diamond ... 

Titanium carbide and titanium nitride coatings for carbide tools that greatly outperform uncoated tools and are taking an increasing share of the market. 

DLC coatings are already in production in several areas (optical and IR windows) and appear particularly well-suited for abrasion and wear applications due to their high hardness and low coefficient of friction. They have an extremely smooth surface and can be deposited with little restriction of geometry and size (as opposed to CVD diamond). These are important advantages and DLC coatings will compete actively with existing hard coatings, such as titanium carbide, titanium nitride, and other thin film... 

Zirconium carbide is a highly refractory compound with excellent properties but, unlike titanium carbide, it has found only limited industrial importance except as coating for atomic-fuel particles (thoria and urania) for nuclear-fission power plants.l " ] This lack of applications may be due to its high price and difficulty in obtaining it free of impurities. 

Coatings play a vital part in the cutting-tool industry and this is where CVD technology has made some of its most important gains. As an example, CVD films of titanium carbide on cemented carbide tools were first commercialized in the early 1960s and their use has continuously increased ever since. Today, the percentage of tools that are coated by either PVD or CVD depends on the type of tool as shown in Table 18.1 (in 1996). 

Titanium Carbide. Carbides of transition metals are known for their hardness, wear resistance and also for their high electrical conductivity, which makes them attractive as a refractory coating material for cutting tools or bearings. Only little work has been done on the electrochemical stability of transition metal carbides with the exception of TiC, where a corrosion and passivation mechanism was suggested by Hintermann et al. [119,120]. This mechanism was confirmed on amorphous TiC produced by metal-... 

Titanium Fibers Boron (coated) Silicon carbide... 

We are depositing a wear resistant titanium carbide coating on steel by the reaction... 

Laser Hardening and Modification. Lasers are used to surface harden ductile steels and improve the toughness to a depth of 0.35 min or more. Lasers can also be used to bond solid or powder coatings to a surface. Typical coalings are nickel or titanium carbide on iron, and nickel, cobalt, manganese, and titanium carbide. TiC. on aluminum. I1 sc of lasers with other specialized coating methods is common. 

Chemical vapor deposition is used industrially to deposit protective hard coatings on metal objects. Common coatings are titanium carbide (TiC), titanium nitride (TiN), titanium oxycarbide (TiCxOy), titanium carbonitride (TiCxNy), titanium oxycarbonitride (TiCxNyOz).91 Coatings based on TiC... 

TiCl3 can be electrochemically regenerated at graphite electrodes coated with titanium carbide 591... 

In order to be able to state that a conductive probe works, it should be stable over at least several hours. This is principally a question of the wear resistance of the conductive coating and additionally of its ability to withstand high current densities or the resulting temperature. Within the production process one has to ensure that the very last nanometers of the tip are conductive [440]. Conductive diamond and other commercially available hard coatings (tungsten carbide, W2C, and titanium nitride, TiN), as well as some other metals evaporated in our in-house production, are used in our studies. 

Coating life in moist atmospheres is also influenced by the effects of moisture on the substrate-coating interface, and marked improvements in life have been claimed by the use of moisture-protective pre-treatments of the substrate. Niederhauser et al ° studied a wide range of metals and titanium nitride, titanium carbide and chromium carbide as pre-treatments. The material was sputter-deposited on a steel substrate, and then sulphided by introducing hydrogen sulphide into the sputtering chamber in order to improve molybdenum disulphide adhesion. They found a marked improvement in life, particularly with a rhodium or palladium interlayer, but the actual degree of improvement is confused because they also used co-sputtered PTFE, and this is discussed further in Section 10.6. 

Titanium carbide/titanium nitride 7 X 10-15 [10] External PVD coating... 

Most recent applications of GD-AES are concerned with surface analysis — mainly depth profiling — of anodic alumina films [273], painted coatings [274], titanium carbide... 

One possibility of exploiting the hardness of pure TiC is by coating cemented carbides. Thin layers (5 to 8 fim) of TiC of Ti(C,N) can be deposited using the CVD process by thermal decomposition of titanium tetrachloride in a methane/hydrogen atmosphere. 

Titanium carbide Coatings for cutting and milling tools, coatings for ball bearings, coatings for extrusion nozzles. 

The second method of surface modification permits the formation of a composite particle, the core of which is composed of polymer (UHMWPE or polyimide) and the surface of which is coated with titanium carbide which is hard and abrasion resistant. The composite particles can be incorporated into any suitable matrix resulting in improved abrasion resistance, lowered fiiction, higher compressive strength, improved creep resistance, etc. This new product is a unique form of raw material which has the potential to improve the properties of many products. 

We have used one-dimensional model [3] to calculate the residual stresses in the system involving a ceramic-like (TiC) coating connected to a metal-like (Ti) substrate by an inter-mediate FGM region, consisting (ultimately after the interdiffusion anneal) of titanium carbide with a carbon concentration that varies with distance. The FGM plate has a thickness 2c, unit dimension in depth (z-direction) and is infinitely long in the x direction, as shown in Fig. 2. 

Wolfe, D. E. and J. Singh. 2000. Titanium carbide coatings deposited by reactive ion beam-assisted, electron beam-physical vapor deposition. Surface and Coatings Technology 124 142-153. 

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