Showing papers on "Saggar published in 2008"

Preparation of oriented hole silicon carbide porous ceramic

Abstract: The invention discloses a preparation method of a porous silicon-carbide ceramic provided with oriented pores. Firstly, according to weight percentage, 0 to 30 percent of carbon powder, 0 to 50 percent of silicon powder and 0 to 60 percent of silica are added into the 10 to 100 percent of the basic material of silicon-carbide; wherein, the granularity of the silicon-carbide is W3.5 to P220, and one granularity or two granularities are adopted for graduation; then the equally mixed materials are processed through powder accumulation or normal ceramic forming process to obtain a green compact which is put into a graphite crucible or a saggar; the graphite crucible or saggar is placed into a vacuum sintering furnace provided with a temperature field with a temperature grade from 15 to 30 DEG C/cm, and then the temperature is raised to 1900 to 2500 DEG C in an argon environment and with pressure of 0.2 to 1 multipliedby 10 Pa, and the insulation work for the graphite crucible or saggar is preserved for 0.5 to 3 hours; finally the temperature naturally falls down under air protection and the sintered body is taken out, namely, the recrystallization porous silicon-carbide ceramic provided with oriented pores is obtained.

Buckling square high temperature sagger

Abstract: A buckle type square high-temperature saggar for high-temperature sintering, high-temperature chemical synthesis and other productions is characterized in that the square case-shaped saggar is composed of a horizontal base plate provided with convex edges at the periphery, a horizontal top plate, and four perpendicular lateral plates held and fixed by the horizontal base plate and the horizontal top plate. By using the structure of the saggar provided in the utility model, which is buckled by six plates, the components of the saggar can conduct thermal expansion, cold-induced contraction and free relative movement and maximally avoid stress concentration, so as to prevent saggar damage due to stress concentration, and improve the thermal shock resistance and prolong the service life of the saggar.

Apparatus and method for use in firing cores

Abstract: Apparatus and method for use in firing a ceramic casting core includes a saggar and a core setter insert disposed in the saggar. The core setter insert can be disposed on a refractory particulate grog bed and/or refractory supports inside the saggar on a bottom wall of the saggar. The core setter insert has a core-receiving surface, which can have an airfoil shape to receive an airfoil-shaped ceramic casting core used in casting hollow airfoil castings.