Area of Technology:Engineering Sciences
Title of the Innovation: High Temperature Erosion Resistant Composites
Brief About Innovation
The composites are prepared by sintering pure tungsten powders in order to obtain a controlled level of interconnected porosity followed by infiltration of molten copper into the porous mass. The above process requires optimisation of numerous parameters such as initial tungsten purity/particle size, the green density of tungsten compact, sintering temperature, sintering time and sintered density, purity of copper, infiltration temperature, infiltration time and machining parameters etc. So, R&D efforts were directed to arrive at the optimised parameters to get defect free WCu composite. The manufacturing process involves using graphite dies for infiltration and refractory metal powder for packing. All other parameters were standardised. The process achieved pore free composite with good machinability and significantly improved yield.
The W-Cu composite has shown excellent erosion resistance and has helped in achieving consistent chamber pressure for 50 sec of firing duration.
The typical room temperature mechanical properties of the W-Cu composite are as follows
The new process is useful in defence applications such as jet vanes, throat nozzles and throat inserts, which are used as altitude controls in thrusters of various missiles as well as the process could be used for civilian applications such as electrical contacts, resistance welding contacts, Electricals discharge machining (EDM) electrodes and porous emitters.
Note*: This technology will be licensed through the bidding process only & the last date of bid submission is 28-05-2023.
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