In-situ formed beta-Sialon combined corundum prefabricated member and production method thereof
A technology for prefabricated parts and corundum, which is applied in the field of high temperature nitriding process to prepare β-Sialon combined corundum prefabricated parts, can solve the problem of no retrieval, etc., and achieve the effects of high service life, simple and feasible process, and good high temperature mechanical properties.
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Embodiment 1
[0032] According to the weight ratio: 30 parts of fused white corundum, 54.4 parts of tabular corundum, 2.3 parts of elemental silicon powder, 0.3 parts of surface-treated metal aluminum powder, 3.0 parts of hydrated alumina, 10 parts of alumina powder, as dispersant 0.15 parts of organic water reducing agent (polyethylene glycol); put the materials prepared according to the above ratio in a mixer and stir for 3-5 minutes, add 4.4% of the total amount of water to mix, and vibrate and cast. After curing for 24 hours After demoulding, the green body is obtained after drying at 300°C.
[0033] Place the green body in a nitriding furnace for nitriding. Under a flowing nitrogen atmosphere with a purity of not less than 99.9%, heat up to 1050°C for 1 hour at a rate of 120°C / hour; heat up to 1250 at a rate of 60°C / hour ℃, keep it for 3 hours; continue to heat up to 1350℃ at a rate of 30℃ / hour for 3 hours; finally, at a rate of 60℃ / hour, heat up to 1460℃ and keep it for 8 hours; when coo...
Embodiment 2
[0036] According to the weight ratio, 30 parts of fused brown corundum, 53.8 parts of tabular corundum, 4.6 parts of elemental silicon powder, 0.6 parts of surface-treated metal aluminum powder, 2.0 parts of hydrated alumina, 8 parts of alumina powder, and silica powder 1 part, 0.20 part of organic water reducing agent (polyethylene glycol) as a dispersant, put it in a mixer and stir for 3-5 minutes, add 4.5% of the total amount of water in the mixture, mix evenly, and vibrate and cast. After curing for 24 hours, demold , After drying at 300°C, the green body is obtained.
[0037] Place the green body in a nitriding furnace for nitriding. In a flowing nitrogen atmosphere with a purity of not less than 99.9%, heat up to 950°C at a rate of 100°C / hour for 2 hours; heat up to a temperature of 80°C / hour Keep the temperature at 1280°C for 4 hours; continue to heat up to 1350°C at a rate of 40°C / hour for 5 hours; finally heat up to 1500°C at a rate of 60°C / hour for 10 hours; turn off th...
Embodiment 3
[0040] According to the parts by weight ratio, 78.2 parts of fused white corundum, 9 parts of elemental silicon powder, 1.3 parts of surface-treated metal aluminum powder, 1.5 parts of hydrated alumina, 10 parts of alumina micropowder, and organic water reducing agent (poly Acrylic) 0.18 parts are placed in a mixer and stirred for 3-5 minutes, then 4.8% of the total amount of water is added to the mixture and mixed uniformly, and then vibrated and poured into shape. After curing for 24 hours, it is demoulded and dried at 300°C to obtain a green body.
[0041] Place the green body in a nitriding furnace for nitriding. In a flowing nitrogen atmosphere with a purity of not less than 99.9%, heat up to 950°C at a rate of 80°C / hour for 1 hour; heat up to a temperature of 60°C / hour 1280℃, heat preservation for 5 hours; continue to heat up to 1350℃ at a rate of 30℃ / hour for 4 hours; finally heat up to 1520℃ at a rate of 30℃ / hour for 6 hours; when cooling to 800℃, turn off nitrogen and con...
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