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公开(公告)号：EP0201178A3
公开(公告)日：1988-03-16
申请号：EP86302204
申请日：1986-03-25
CPC分类号： C04B35/65 , C04B35/565 , C04B35/64 , H05B7/00 , H05H1/44
摘要： A furnace (10) for the sintering of refractory or ceramic materials using plasma heated gases. The furnace comprises a sintering chamber (12) with strategic positioning of the plasma torch inlets (14 and 14') and exhaust outlet (16), and means for controlling the furnace temperature during sintering so that the article being sintered does not decompose. Means for controlling the furnace temperature during sintering include: 1) Tangential injection of a secondary colder gas stream into the hot primary plasma gas stream; 2) Utilisation of a plasma torch or torches which can be temperature controlled to achieve stable and lower plasma gas temperatures; and 3) Introduction of a secondary cooler gas directly into the furnace sintering chamber.
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公开(公告)号：EP0197702A3
公开(公告)日：1987-01-28
申请号：EP86302205
申请日：1986-03-25
CPC分类号： C04B35/64 , C04B35/565
摘要： A process for the sintering of silicon carbide refractory or ceramic articles using plasma arc gases. In the process of the invention, a formed silicon carbide article is heated in a plasma fired furnace to a sintering temperature of between 2000°C - 2500°C at a heating rate of 300°C/hr - 2000°C/hr, and held at the sintering temperature for 0.1 - 2 hours. The enthalpy of the plasma gas is 2000 BTU/Ib - 4000 BTU/ib (4652 kJ/kg - 9304 kJ/kg), when nitrogen is used as the plasma gas. The total cycle time for the process, including cooling and loading, is 1.5 - 20 hours. Silicon carbide articles, produced in accordance with the invention, have high strength, high density, high corrosion resistance and high dimensional stability.
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3.发明公开A sintering or reaction sintering process for ceramic or refractory materials using plasma arc gases 失效一种用于通过等离子电弧气体的手段陶瓷或耐火材料的烧结或反应烧结过程。
公开(公告)号：EP0135862A2
公开(公告)日：1985-04-03
申请号：EP84110525.7
申请日：1984-09-04
摘要： A process for sintering or reaction sintering ceramic or refractory materials with hot plasma gases. The hot plasma gases are produced by injecting a combined primary plasma arc with a secondary gas stream directly into a reaction furnace. The secondary gas stream is tangentially injected into the primary plasma arc gas stream to mix the gases for the required sintering temperature at the highest energy efficiency. The plasma torches are positioned in the furnace ports so that the plasma gas flow is perpendicular to the furnace process gas flow. This process is inexpensive and efficient and results in a superior quality sintered product. It may be adapted to continuous or periodic kilns to achieve a high furnace productivity.
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4.发明授权A sintering or reaction sintering process for ceramic or refractory materials using plasma arc gases 失效使用等离子弧气体的陶瓷或耐火材料的烧结或反应烧结工艺
公开(公告)号：EP0135862B1
公开(公告)日：1990-03-21
申请号：EP84110525.7
申请日：1984-09-04
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公开(公告)号：EP0228864A3
公开(公告)日：1988-02-24
申请号：EP86309823
申请日：1986-12-16
CPC分类号： F27B5/10 , C04B35/565 , C04B35/64 , F27B17/0016 , F27B21/00 , F27D5/0068 , F27D99/0001 , H05B7/00 , Y10T428/2975
摘要： An improved process for sintering extruded powder shapes comprising drying or calcining an extruded shape in a microwave furnace and rapid sintering the shape in a plasma fired furnace. Alternatively, calcining or drying may take place within a furnace heated by the plasma furnace's exhaust. The process of the invention is especially useful for silicon carbide extruded materials and for tubular shapes. This process significantly reduces sintering times and costs. Use of the process yields a high strength sintered product.
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6.发明公开A sintering or reaction sintering process for ceramic or refractory materials using plasma arc gases 失效使用等离子体气体的陶瓷或耐火材料的烧结或反应烧结工艺
公开(公告)号：EP0135862A3
公开(公告)日：1986-07-16
申请号：EP84110525
申请日：1984-09-04
摘要： A process for sintering or reaction sintering ceramic or refractory materials with hot plasma gases. The hot plasma gases are produced by injecting a combined primary plasma arc with a secondary gas stream directly into a reaction furnace. The secondary gas stream is tangentially injected into the primary plasma arc gas stream to mix the gases for the required sintering temperature at the highest energy efficiency. The plasma torches are positioned in the furnace ports so that the plasma gas flow is perpendicular to the furnace process gas flow. This process is inexpensive and efficient and results in a superior quality sintered product. It may be adapted to continuous or periodic kilns to achieve a high furnace productivity.
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