Preparation, Structure, and Mechanical Properties of a Mo–Si–B Layered Composite

Resumo

A procedure is developed for producing layered composite materials of molybdenum foil and silicon and aluminum powders. Materials, whose structure is a sequential alternation of layers of solid solutions based on molybdenum and Mo–Si–B intermetallic layers, are obtained. Testing at room temperature for three-point bending showed a strength of 400–740 MPa, a crack resistance of 9–20 MPa m^1/2, an effective surface energy of 6–10 × 10³ J/m², a strength of 320–360 MPa at a temperature of 1100°C and 230–290 MPa at a temperature of 1300°C. The microstructure of the composites is investigated before and after destruction. Based on an analysis of the structure of the test samples, various mechanisms are identified that inhibit the destruction process.