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    • 4. 发明公开
    • System for preventing decomposition of silicon carbide articles during sintering
    • Verfahren zurZersetzungsverhütungvonSiliziumcarbidformkörpernbeim Sintern。
    • EP0275614A1
    • 1988-07-27
    • EP87300459.2
    • 1987-01-20
    • THE CARBORUNDUM COMPANY
    • Kim, Jonathan J.Katz, Joel D.
    • C04B35/56C04B35/64
    • C04B35/64F27B5/10F27B17/0016
    • A system to prevent, retard or reverse the decomposition of silicon carbide articles during high temperature plasma sintering. Preferably, the system comprises sintering a silicon carbide refractory or ceramic green body in a closed sintering environment, such as a covered crucible, with strategic placement of the plasma torch or torches, exhaust outlet and crucibles. As sintering proceeds, a silicon vapor pressure builds up within the crucible, retarding the decomposition of the silicon carbide body. The plasma torch, exhaust outlet, and crucibles are positioned so that buoyant convective flow is maximized to increase the heat transfer and energy efficiency. In another embodiment, a "sacrificial" source of silicon carbide is placed into the sintering furnace. The silicon carbide in the sacrificial source starts to decompose before the silicon carbide refractory or ceramic article, creating a supersaturated atmosphere of silicon vapor species in the furnace. This prevents, retards or reverses the silicon carbide decomposition reactions and thus maintains the integrity of the refractory or ceramic article being sintered. Preferably, the sacrificial source is placed in a closed sintering environment along with the silicon carbide article being sintered.
    • 一种在高温等离子烧结过程中防止,延缓或反转碳化硅制品分解的系统。 优选地,该系统包括在封闭的烧结环境例如覆盖的坩埚中烧结碳化硅耐火材料或陶瓷生坯,其中等离子体焰炬或火炬,排气出口和坩埚具有战略位置。 随着烧结的进行,硅蒸汽压力积聚在坩埚内,从而阻止碳化硅体的分解。 定位等离子体焰炬,排气出口和坩埚,使浮力对流最大化,从而增加热传递和能量效率。 在另一个实施例中,将碳化硅的“牺牲”源放入烧结炉中。 牺牲源中的碳化硅在碳化硅耐火材料或陶瓷制品之前开始分解,在炉中产生硅蒸气物质的过饱和气氛。 这防止,阻碍或反转碳化硅分解反应,从而保持烧结的耐火材料或陶瓷制品的完整性。 优选地,将牺牲源与烧结的碳化硅制品一起放置在封闭的烧结环境中。
    • 5. 发明公开
    • System for preventing decomposition of silicon carbide articles during sintering
    • Verfahren zurZersetzungsverhütungvonSiliziumcarbidformkörpernbeim Sintern。
    • EP0239304A2
    • 1987-09-30
    • EP87302281.8
    • 1987-03-17
    • THE CARBORUNDUM COMPANY
    • Kim, Jonathan J.Katz, Joel D.
    • C04B35/56C04B35/64
    • F27B5/10C04B35/565C04B35/64F27B17/00F27B17/0016F27D3/12F27D5/005F27D99/0001
    • A system to prevent, retard or reverse the decomposition of silicon carbide articles during high temperature plasma sintering. Preferably, the system comprises sintering a silicon carbide refractory or ceramic green body in a closed sintering environment, such as a closed tube, with strategic placement of the plasma torch or torches, exhaust outlet and tube. As sintering proceeds, a silicon vapour pressure builds up within the tube, retarding the decomposition of the silicon carbide body. The plasma torch, exhaust outlet, and tubes are positioned so that buoyant convective flow is maximised to increase the heat transfer and energy efficiency. In another embodiment, a "sacrificial" source of silicon carbide is placed into the sintering furnace. The silicon carbide in the sacrificial source starts to decompose before the silicon carbide refractory or ceramic article, creating a supersaturated atmosphere of silicon vapour species in the furnace. This prevents, retards or reverses the silicon carbide decomposition reactions and thus maintains the integrity of the refractory or ceramic article being sintered. Preferably, the sacrificial source is placed in a closed sintering environment along with the silicon carbide articles being sintered.
    • 一种在高温等离子烧结过程中防止,延缓或反转碳化硅制品分解的系统。 优选地,该系统包括在封闭的烧结环境(例如封闭管)中烧结碳化硅耐火材料或陶瓷生坯,具有等离子体焰炬或火炬,排气出口和管的战略放置。 随着烧结的进行,硅蒸汽压在管内形成,从而阻止碳化硅体的分解。 定位等离子体焰炬,排气出口和管,使得浮力对流最大化,以增加热传递和能量效率。 在另一个实施例中,将碳化硅的“牺牲”源放入烧结炉中。 牺牲源中的碳化硅在碳化硅耐火材料或陶瓷制品之前开始分解,在炉中产生硅蒸气物质的过饱和气氛。 这防止,阻碍或反转碳化硅分解反应,从而保持烧结的耐火材料或陶瓷制品的完整性。 优选地,将牺牲源与烧结的碳化硅制品一起放置在封闭的烧结环境中。