Method for preparing high performance silicon oxide combining silicon carbide refractory by low-temperature sintering
A technology of low-temperature firing and refractory materials, applied in the field of refractory materials, can solve problems such as reducing the high-temperature performance of materials, and achieve the effects of avoiding pollution, avoiding adverse effects, and reducing firing energy consumption
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[0023] Example 1:
[0024] 50% of SiC particles with a particle size of 1-2mm, 30% of SiC particles with a particle size of 0.1-1mm, 15% of SiC fine powder with a particle size of ≤0.088mm, and SiO with a size of ≤20μm 2 5% fine powder, plus 6% phenolic resin solution as a binder, mixed evenly in a sand mixer, and the mud was machine-pressed on a hydraulic press to obtain a 500×450×12mm green body. hours dry. Put the green body into a stainless steel container, put it in a vacuum chamber, evacuated to a vacuum of 25kPa, kept for 5 minutes, and slowly injected an alkaline silica sol solution (SiO 2 Concentration 25%, PH value = 8.5~10) to completely submerge the green body, the liquid level is 11mm higher than the green body, keep it for 15 minutes under the same vacuum condition, and then keep it in the air state for 10 minutes, take out the green body at 110 ℃ After 3 hours of drying, the green body is placed in a shuttle kiln, and fired in an air atmosphere. Through X-ray...
Example Embodiment
[0025] Example 2:
[0026] 45% of SiC particles with a particle size of 1 to 3 mm, 30% of SiC particles of 0.1 to 1 mm, 20% of SiC fine powder of ≤0.092mm, and SiO of ≤15μm 2 Fine powder 4.5%, Si powder ≤60μm 0.5%, plus 5% furan resin solution as binder, mix evenly in a sand mixer, and press the mud on a hydraulic press to form a 500×550×15mm body , the green body was dried at 180°C for 10 hours. Put the cooled blank into an aluminum container, put it into a vacuum chamber, evacuate to a vacuum of 30kPa, keep it for 10 minutes, and slowly inject a silica sol solution (SiO 2 Concentration 20%, PH value = 9.7) submerge the green body and the liquid level is 15mm higher than the green body, keep it for 20 minutes under the condition of vacuum degree 30kPa, then keep it in the air state for 12 minutes, take out the green body at 150 ℃ for 8 hours dry. The above process is repeated, and the green body is further subjected to a silica sol impregnation treatment. Then the green b...
Example Embodiment
[0027] Example 3:
[0028] 15% of SiC particles with a particle size of 3 to 5mm, 35% of SiC particles of 1 to 3mm, 15% of SiC particles of 0.1 to 1mm, 26% of SiC fine powder of ≤0.076mm, and SiO of ≤25μm 2 9% fine powder, plus 2.0% phenolic resin solution and 2.0% furan resin solution, mix them evenly in a sand mixer, and press the mud on a hydraulic press to form a 200×80×60mm blank. Dry at 190°C for 25 hours. Put the cooled blank into a stainless steel container, put it in a vacuum chamber, evacuate to a vacuum of 27kPa, keep it for 10 minutes, and slowly inject a silica sol solution (SiO 2 Concentration 20%, PH value = 10.2) completely submerge the green body, the liquid level is 25mm higher than the green body, keep it for 15 minutes under the condition of vacuum degree 27kPa, then keep it in the air state for 15 minutes, take out the green body at 130 ° C for 9 hours dry. The green body is placed in a shuttle kiln and fired in an air atmosphere. The maximum firing tem...
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