REACTION-SINTERING OF MOLYBDENUM DISILICIDE (MOSI2) MATRIX COMPOSITES

REINFORCEMENT OF A MOLYBDENUM DISILICIDE MATRIX IS NECESSARY FOR ITS STRUCTURAL APPLICATIONS. CONVENTIONAL METHODS OFPRODUCING MOSI2 COMPOSITES ARE LABOR AND ENERGY INTENSIVE, AND HAVE THE PROBLEM OF PRESERVING THE STRUCTURAL INTEGRITY OF THE REINFORCEMENT. BENCHMARK'S INNOVATIVE METHOD CONSISTS OF SIMULTANEOUS MOSI2 POWDER SYNTHESIS AND COMPOSITE CONSOLIDATION THROUGH REACTION-SINTERING BY ITS CONTROLLED COMBUSTION-SYNTHESIS TECHNIQUE. PROPERLY CHOSEN RAW MATERIALS, COMBINED WITH SUITABLE TREATMENT OF THE REACTANT MIXTURE, AND FOLLOWED BY ADEQUATE MIXING-DISPERSION OF THE REINFORCEMENT, ALLOWS FOR FABRICATION OF MOSI2 COMPOSITES. THE SPEED OF THE POWDER SYNTHESIS TOGETHER WITH THE REACTION-SINTERING FEATURE OF THE PROCESS CAN PROVIDE A FULLY CONSOLIDATED BODY WITH NO REINFORCEMENT DAMAGE. THE PROPAGATION MODE OF THE COMBUSTION FRONT AND THE POST-COMBUSTION STAGE FEATURESPERMIT FULL CONTROL OF THE MATRIX PARTICLE SIZE DISTRIBUTION, ITS STRUCTURE, AND THE WHOLE COMPOSITE CONSOLIDATION. THE PROCESS IS SIMPLE,INEXPENSIVE, AND CAN BE EASILY SCALED UP, MAKING IT COMMERCIALLY ATTRACTIVE. BENCHMARK'S DEVELOPMENT OF THE CONTROLLED COMBUSTION-SYNTHESIS TECHNIQUE MAKES POSSIBLE THE FABRICATION OF ADVANCED CERAMIC MATERIALS, SINGLE PHASES AND COMPOSITES, WITH A PRE-DETERMINED COMPOSITION AND STRUCTURE. TECHNICAL ASSISTANCE AND TESTING WILL BE PROVIDED BY TEXTRON SPECIALTY MATERIALS, A SUBSIDIARY OF TEXTRON, INC. ANTICIPATED BENEFITS/POTENTIAL COMMERCIAL APPLICATIONS - HIGH PERFORMANCE MOLYBDENUM DISILICIDE COMPOSITES PRODUCED FROM INEXPENSIVE RAW MATERIALS BY CONTROLLED COMBUSTION-SYNTHESIS TECHNIQUE ARE CHARACTERIZED BY LOW ENERGY CONSUMPTION AND SHORT-RUN PROCESSES, AND ARE EXPECTED TO FIND FAST GROWING INDUSTRIAL APPLICATIONS IN HIGH TEMPERATURE, CORROSIVE ENVIRONMENTS.