Method of manufacturing parts or powders of a nitride compound of silicon or of a metal by reacting silicon or metal parts or powders in the solid state with a nitrogen-containing reactive gas
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United States of America Patent
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Mar 18, 1986
Grant Date -
N/A
app pub date -
Apr 10, 1984
filing date -
Apr 13, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of manufacturing parts or powders made of a compound of silicon or of a metal by exothermally reacting parts or powders of silicon or a metal in the solid state with a gas, wherein the differential flow rate or the pressure variation of the reactive gas in contact with the part or the powder is sensed, and the reaction is performed at increasing temperatures as a function of the said differential flow rate or pressure of the reactive gas: the improvement wherein a maximum differential flow rate or a maximum speed of pressure drop of the reactive gas is predetermined as a function of the chemical nature of the parts or powders, and optionally as a function of the density and the size of the parts, and the rise in temperature is suspended when the differential flow rate or the speed of pressure drop of the reactive gas reaches the predetermined maximum value, beyond which the reaction would run away and prevent complete transformation of the parts or the powders being obtained.
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