The main reason for the decrease of the strength after ZrO addition is that the ZrO phase change during the cooling process of the material and there will be micro-cracks, and the amount of stomata added affects the bulk density of the sample performance. The degree of direct bonding between the particles and the matrix is ​​reduced due to the influence of ZrO. However, after ZrO addition exceeds a certain level, the dispersion strengthening of the ZrO grains present at grain boundaries and in solid solution will play a major role and the strength will increase significantly. In the initial stage of ZrO addition, the increase in the amount of addition increases the retention of the residual strength of the material. However, when the addition amount reaches a certain level, the retention of the residual strength of the material decreases as the addition amount of ZrO increases. This is mainly due to the large amount of added, under a large thermal shock temperature, ZrO and the matrix in the thermal expansion rate and elastic modulus of the mismatch caused a greater internal stress, at the same time the occurrence of micro-cracks, so that the energy dispersion ability to reduce , so that after the heat shock intensity reduction ratio increased.
The ZrO phase transformation increases the strength of the ceramic material. Refractory fuel-fired tunnel kiln fired abroad to produce high-performance sintered zircon bricks, whose physicochemical properties have reached the level of similar foreign products, while greatly simplifying the production process of zircon bricks, reducing production costs and accelerating domestic The application and promotion of high quality machine press zircon bricks. Magnesia carbon brick has a good anti-stripping, is a widely used refractory material. However, due to its poor oxidation resistance, it has greatly affected its further promotion and application. For this reason, people have conducted many researches. It plays an important role in inhibiting the oxidation of magnesia-carbon bricks, but because different boron-containing compounds have different effects on magnesia-carbon bricks, it is necessary to further develop the correct use of each boron-containing compound according to the conditions of use. Research.
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