Oxidation resistance of molybdenum silicon boride composite
AssigneeTrelleborg Applied Technologies
InventorsPeter E. Marshall, Carol Ann M. Wedding, Oliver M. Strbik, III
Life of this patent
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Abstract
Molybdenum composites containing silicon and boron for environmental resistance are combined so as to minimize the silicon solid solution in the molybdenum phase. The composites include ratios of molybdenum, silicon, and boron to form three phase mixtures of molybdenum, A15 (Mo3Si), and T2 (Mo5SiB2) or molybdenum, SiO2, and T2 (Mo5SiB2). Beneficial additives, including manganese and strontium aluminosilicate, are included to improve the composite's properties. Manufacturing processes to produce these composites as either powders or solid parts are included.
Claims20
The process of forming a molybdenum silicon boride reacted high density composite part which comprises:
- a. forming a slurry of molybdenum, silicon oxide, silicon nitride, boron nitride, and a liquid;
- b. spray drying the slurry to form a homogenous, unreacted powder mixture;
- c. reacting the homogeneous powder mixture in a reducing atmosphere at an elevated temperature to form a three phase composite powder of Moss, silicon oxide and T2 (Mo5SiB2), in which the Moss contains less than about 3 atomic percent silicon in solution in equilibrium with the T2;
- d. compacting the reacted composite powder;
- and
- e. sintering the compacted reacted composite powder at an elevated temperature and pressure to form a reacted high density composite part.
The process of forming a molybdenum silicon boride reacted high density composite part which comprises:
- a. forming a slurry of molybdenum, silicon oxide, silicon nitride, boron nitride, and a liquid;
- b. spray drying the slurry to form a homogenous, unreacted powder mixture;
- c. compacting the reacted composite powder;
- and
- d. reacting the homogeneous powder mixture in a reducing atmosphere at an elevated temperature to form a three phase composite powder of Moss, silicon oxide and T2 (Mo5SiB2), in which the Moss contains less than about 3 atomic percent silicon in solution in equilibrium with the T2;
- e. sintering the compacted reacted composite powder at an elevated temperature and pressure to form a reacted high density composite part.
Dependencies are inferred from the claim text.