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factors affecting microwave sintering
2020-08-04
The factors affecting microwave sintering include microwave power, frequency, heating time and the properties of the material itself. The products obtained by microwave sintering and traditional sintering are different in grain size, density, porosity and various properties. The application research of microwave sintering technology is also launched around these aspects.
Research on the factors affecting microwave sintering Lin et al. used microwaves with different frequencies of 24 GHz and 2.45 GHz to sinter ZnO electronic ceramics. They found that because 24 GHz microwaves can increase the density of the porcelain body more than 2.45 GHz, the electrical properties are better under the same conditions. Good ZnO resistance. Xie et al. used different sintering times to obtain ferroelectric ceramics with different dielectric properties. Bhaskar et al. used the microwave method to sinter MgCuZn ferrites with different Mn contents and obtained products with very different properties.
Research on the properties of sintered products. Microwave heating has uniform temperature field and low thermal stress, which is suitable for rapid sintering. In addition, the effect of microwave electromagnetic field promotes diffusion and accelerates the sintering process, which can refine the grains of ceramic materials, effectively inhibit the abnormal growth of grains, and improve the uniformity of the material's microstructure. Thakur et al. used microwave sintering of Ba0.95Sr0.05TiO2 ceramics, and the products obtained have good and uniform grain size, higher linear thermal expansion coefficient and Curie temperature, and electrical properties have also been improved. Singh et al. studied the Sm-doped PTC ceramics and obtained microwave sintered products with higher coercive magnetic field coefficients.
As a new type of sintering method, microwave sintering can quickly reach the high temperature that is difficult to reach by conventional sintering. It has the characteristics of immediacy, integrity, selectivity, high efficiency and safety of heating.
