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Phase Equilibria Investigation of Binary, Ternary, and Higher Order Systems, Part V - The Phase Diagram W-B-C

Report Number: AFML TR 69-117 Part 5
Author: Rudy, E.
Corporate Author: Aerojet-General Corporation
Laboratory: Air Force Materials Laboratory
Date of Publication: 1970-08
Pages: 62
Contract: F33615-67-C-1513
Project: 7350
Task: 735001
AD Number: AD0713154

The ternary alloy system W-B-C was investigated experimentally by means of X-ray, melting point, DTA, and metallographic techniques on hot pressed and heat treated, as well as melted specimens, and a phase diagram from 1500C through the melting range established. No ternary phases are formed in the system and the mutual solubilities between carbide and boride phases are small. The solid state sections (2000C) are characterized by two-phase equilibria existing between the phase pairs W2B + W2C, W2B + WC, WC + WB, WB + C, W2B5 + C, W2B5 + B4C, and WB approximately 4 + B4C. The two-phase equilibrium W2B + WC is replaced by an equilibrium W2C + WB above 2150C. Fifteen ternary isothermal reactions were found. Five are associated with pseudobinary eutectic equilibria, six with ternary eutectics, and the remaining four with class II ternary four-phase reaction isotherms.

Lockheed Martin Missiles & Fire Control
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