Title:
METHOD OF PREVENTING DECOMPOSITION OF SILICON CARBIDE PRODUCT DURING SINTERING
Document Type and Number:
Japanese Patent JPS62270465
Kind Code:
A
Abstract:
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.
Inventors:
JIYONASAN JIEI KIMU
JIYOERU DEI KATSUTSU
JIYOERU DEI KATSUTSU
Application Number:
JP6813587A
Publication Date:
November 24, 1987
Filing Date:
March 24, 1987
Export Citation:
Assignee:
KENNECOTT CORP
International Classes:
C04B35/565; C04B35/64; F27B5/10; F27B17/00; F27D3/12; F27D5/00; F27D99/00; (IPC1-7): C04B35/56; C04B35/64
Attorney, Agent or Firm:
Heikichi Odashima
Previous Patent: MANUFACTURE OF CARBON FIBER REINFORCED CARBON COMPOSITE MATERIAL
Next Patent: ALUMINUM NITRIDE BASE SINTERED BODY
Next Patent: ALUMINUM NITRIDE BASE SINTERED BODY