With the addition of the modified resin sample, the strength did not decrease significantly at medium and low temperatures, and the strength increased with the addition of the modified resin. The flexural strength at room temperature of the sample after burning at 600-1000°C increased with the increase of the amount of modified resin added, especially after the sample was burned at 600°C, the strength of the sample with 2%(w) modified resin was significantly increased. From 6MPa to 15MPa, it can be seen that the modified resin can significantly improve the low-temperature strength of non-burned skateboards. The thickness of the refractory layer increases with increasing temperature, and when the temperature further rises to 1000°C, the thickness of the oxide layer decreases again. After the samples were burned at different temperatures, the flexural strength of the samples with the modified resin increased significantly at room temperature.
After the modified resin is added, the apparent porosity of the sample increases, the bulk density decreases, and the oxidation resistance of the sample decreases. After the modified resin is oxidized, a new ceramic phase is formed, which improves the bonding strength of the material. Production and use Through the above discussion and comparison, the samples A2 and A3 have good effects. Because the forming performance of the sample A3 is poor and the price of the modified resin is high, the formula of the sample A2 is selected according to various powders→pre Mixing → mixing (particles, binders at all levels) → forming → drying → ferrule → grinding → sticking pad → finished product production process. The performance of production of non-burned skateboards is: apparent porosity 9.6%, bulk density 2.98g/cm, compressive strength 125MPa, high temperature flexural strength (1400°C, buried charcoal) 43.7MPa. Site use conditions: 120t ladle; smelting steel mainly for low-alloy steel, shipboard steel, boiler and pressure vessel steel, etc.; molten steel by LF refining treatment; using a domestic manufacturer of institutions.
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