| In recent years,there are mainly metal and carbon-based materials in the selection of energy-absorbing materials,but the reliability and energy-absorbing density of these materials are not very high,and they cannot meet their needs in more high-power working environments..The demand for materials for modernization is developing toward the direction of low mass,small size,high stability,and wide application range,and the ZnO energy-releasing ceramic material just meets such requirements.The preparation technology of ZnO energy-releasing ceramics is relatively simple,the cost is controllable,the performance is relatively stable and has a relatively high energy absorption density,and has more outstanding advantages compared to the traditional metal and carbon materials.Not only that,the energy-releasing ceramic materials are less affected by the environment and can be used in a variety of energy-absorbing situations,have the potential to replace traditional materials,and have received extensive attention.This article makes a detailed discussion on the preparation process and related performance analysis of ZnO energy-releasing ceramic materials.First of all,we studied the effect of doping on ZnO energy-releasing ceramics.Al2O3 and MgO with different concentration gradients were mixed.Samples with different distribution ratios were prepared by the same sintering process.Then,the microstructure and electrical properties of different samples were tested and analyzed.The results show that the incorporation of impurities makes the energy-releasing ceramics generate spinel phase particles,so that the grain boundary barrier changes,and plays a role in refining the particles,raising the energy absorption density and relative density of ceramic materials,reducing the material The resistivity,as well as some other properties have different effects.It was found that when the Al concentration was 2.0at%,the resistivity of the material was reduced to 2.12?·cm,the energy density was720 J/cm3,and when the Mg dopant concentration was 8.0 at%,the temperature coefficient of the resistivity of the material was 0.8×10-3?·cm/°C,energy density 740J/cm3.Then we also explored the sintering process of ceramic materials.Under the same raw material ratio,we changed the sintering process and tested and analyzed the performance of different samples.The results show that when the powder is molded,the pressure is 8 MPa,and the sample material with a complete structure and good performance can be obtained.At the same time,through comparison of different sintering temperature,holding time,and temperature rate,we found that the sintering temperature is 1400°C and it is combined with the segmented sintering method.The sample has good performance,its resistivity is 2.74?·cm,and the nonlinear coefficient is 1.09,energy density is 720 J/cm3.Finally,we found that ZnO energy-releasing ceramics prepared by a certain doping and under a suitable sintering process have better microstructures and corresponding electrical properties. |
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