Dark blue nano tungsten oxide not only may be applied for producing infrared absorption material, but can be used to treat the problem of tungsten skeleton with high pre-sintering temperature and the existence of closed cells. Some researchers have added a certain amount of blue tungsten oxide powder to tungsten powder. According to the reduction characteristics of blue tungsten oxide powder, tungsten powder of different particle diameters is formed during the reduction process, and the reduction of the interface energy and the water vapor generated in the process can ensure the smooth formation of the pore, and form a certain strength skeleton network at a lower temperature.
Many of you may know that one of the keys to the preparation of tungsten-copper composites by the commonly used infiltration method is to prepare a tungsten skeleton with uniform structure, good wettability to copper, low impurity content, and a certain number of connected pores. The most common method for preparing tungsten skeleton is high-temperature pre-sintering method, that is, tungsten powder is first pressed into a blank with relatively low density at a relatively low pressure, and then sintered at a temperature of about 2000°C for a long time to obtain a tungsten skeleton of the desired relative density.
However, the process has shortcomings: high sintering temperature, long sintering time, and many closed cells. The relative density of the tungsten-copper composite after infiltration is low, the energy consumption is large, the requirements on the equipment are high, and the process is difficult to control. Therefore, blue tungsten oxide is used as it may solve the problem of high pre-sintering temperature of tungsten skeleton and the existence of closed cells.
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