Abstract
The plating conditions of titanium carbide on iron were investigated in the temperature range of 850-1100°C. Hydrocarbon mixed with titanium tetrachloride carried by hydrogen was introduced over a test specimen of cast iron or mild steel. The direct coating on iron resulted in severe corrosion and cementation of the ground metal, which disturbed the adherence of carbide layer. However, preliminary electroplating of cobalt on the iron was found to be effective for preventing the corrosion and cementation.
Titanium carbide layer was obtained above 900°C only, and its growth rate showed a maximum at 950-1000°C. The increase in the thickness of the carbide layer formed was determined to be proportional to the plating time by the curve representing the weight increase.
The layer was apt to be deposited at the position near the gas inlet above 950°C. The growth rate attained to 1.9μ/min. at 950°C in case of the flow rates of hydrogen and propane were 7 and 0.32cc/s., respectively The availability of the constituent carbon in various hydrocarbons was arranged in the decreasing order as folllows:
i-C5H12>C2H6>C3H8>C3H6>C2H4>CO>CH4
