A New Approach to Performing Thermally Coupled Processes by the Example of a (Ni + Al)–(Ti + C) Granular Mixture

详细

For the first time, for performing thermally coupled SHS processes, granular mixtures were used instead of powder ones. In this case, the rate of the heat transfer between the donor and the acceptor is virtually independent of the sample size and is determined only by the granule size. Therefore, an advantage of using a granular mixture is that the process optimized under laboratory conditions can be scaled without changing its characteristics and the properties of the desired synthesis product. The studied granular mixture comprised a mixture of (Ni + Al) granules (acceptor) and a mixture of (Ti + C) granules (donor), which differed in rate and temperature of combustion. It was determined that the ignition of the (Ni + Al) acceptor granules occurred in the combustion front. It was shown that using granular mixtures for performing coupled thermal reactions makes it possible to obtain the combustion products as a readily destructible sample, from which the desired product can be separated even if the melting point of the product of the interaction of the acceptor mixture is lower than the adiabatic combustion temperature.