METHOD OF MAKING STRIPS FROM MOLYBDENUM-BASED COMPOSITE MATERIAL BEARING COPPER Russian patent published in 2013 - IPC B22F7/00 

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy, particularly, to production of controlled-thickness strips from composite materials for cermet assemblies used in vacuum tubes and semiconductors. Initial powders are mixed and rolled to strips to be stacked. Obtained stack is welded by fusion and rolled. Note here that rolled powders feature two compositions, one with optimum copper content and another one with decreased copper content. Sintering and rolling are performed to ensure porosity in strips with decreased copper content of 10-20% absence of porosity in those with optimum copper content. Stack is assembled with alternation of porous and nonporous strips while deficient copper is fitted between strips of the stack. Note here that stack welding is carried out at temperature some 70-100°C higher than that of copper melting point and exposure of 10-20 min.

EFFECT: increased relative density decreased anisotropy.

2 cl, 1 tbl