Appliance for coating mouldings with silicon carbide

摘要

In order to coat mouldings of any shape with silicon carbide a system is used in which the gas nozzles, some of which are individually adjustable in terms of their direction and/or are separately controllable in terms of the gas flow, are arranged on concentric circles and with respect to the vertical are tilted outwards by an angle alpha . In addition, the following conditions relating to the gas nozzle arrangement, gas nozzle cross section, gas flow and dimensions of the coating chamber must be met: <IMAGE> where the symbols have the following meaning: n = number of the concentric circles on which gas nozzles are arranged; D = horizontal diameter of the coating chamber [cm]; d = greatest horizontal extent of the moulding [cm]; qi = diameter of the individual gas nozzles on the ith concentric circle (i = 1.2, ..., n) [cm]; alpha i = angle of tilt of the gas nozzles on the ith concentric circle (i = 1,2, ..., n) [ DEG ]; Qi = total cross-sectional area of all the gas nozzles on the ith concentric circle (i = 1, ..., n) [cm<2>]; Ri = radius of the ith concentric circle (i = 1, ..., n) [cm]; R = gas flow [cm<3>/sec] for the gas mixture of coating gas and dilution gas.