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The preheating of graphite crucible plays an important role in the process of crucible, and the service life of the crucible is greatly enhanced if the preheating method is right, conversely, the service life of crucible is over if the preheating method is incorrect. So what's the right way to warm it? 1).The graphite crucible is a ceramic product, it has a certain number of pores in the crucible wall , they are easy to absorb the moisture, so for the first time using crucible and under the conditions of having no any material in it ,the crucible must be preheated to ensure that no residual moisture in the crucible wall: it is best to put it nearby the stove…
Under normal temperature and pressure, the phenolic resin impregnated carbon graphite block material can increase the weight gain rate, open porosity, hardness and bending strength of the basic performance, and through the muffle furnace and thermogravimetry analysis of its thermal stability. Phenolic resin impregnated graphite block has a better thermal stability from 0 to 450 centigrade, when the impregnated graphite is decomposed and the thermal stability is poor at more than 450 centigrade. The mechanical properties of graphite, easy to crack, fragile, limiting its use, phenolic resin has the characteristics of high thermal stability, integrity and solvent resistance and it a good binder reduce the porosity and improve the mechanical properties of graphite, and phenolic resin impregnated graphite block has…
A groove graphite boat, which comprises a plurality of with the relative groove surface and bottom supporting protrusions W-shaped bidirectional skewed, bottom surface, face, side, side and the upper end relative to the mouth and two corresponding slot surface were designed with at least a vent groove, bottom bulge supports and the relative groove surface intersection, respectively, and the design of an angular slot protective. Bottom surface at either of two adjacent W-shaped bidirectional skewed slots forming the protrusion of the lower design parallel to W-shaped bidirectional skewed slots, section shape is approximate of the V-shaped grooves. The utility model makes the hard alloy strip product uniformly in the process of hydrogen and vacuum sintering, so as to avoid the…
