Production of vacuum-tight molybdenum-copper-nickel materials by liquid-phase sintering and infiltration
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In the infiltration of composite materials in a gaseous environment there are narrow ranges of values of porosity, temperature, and treatment time within which the materials become vacuum-tight.
The process of infiltration of MD15N.P Mo-Cu-Ni composite alloy consists of two stages: viscous capillary flow of the infiltrate, with the displacement of the primary matrix phase, and diffusional transport of the secondary matrix phase to the specimen center and of gases to the surface.
If composite materials of this type are to be vacuum-tight, they must be infiltrated at a temperature not exceeding the temperature of formation of their refractory skeletons.
The new method of studying the infiltration process, based on the use of indicator elements and on analysis of the matrix phase by selective dissolution, can be employed in development work on techniques for the infiltration of composite materials.
KeywordsPorosity Composite Material Treatment Time Narrow Range Matrix Phase
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