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How to use the graphite crucible in a right is important. The first time to use it,we should heat the crucible under a 1300~1500 centigrade,and after 2~3 times,the surface of the crucible could form a sinter layer,so the service life will be longer. If we use it without the sinter layer for the first time, and melting the fusible metal,such as tin,vanadium,aluminum etc,the crucible will be broken quickly,and the graphite will be fire when it reach 700 centigrade. The crucible should be put onto the special base,and the Dia of the base should be the same as the crucible. And there should be some graphite powder and coal powder on the base. And the material of the base should also…
The service life of the graphite crucible is mainly affected by the way of using. Many customers say that their crucibles will be broken or crack after several times, and they think the problem is from the crucible quality, however,if we could use it in a better way or a right way,the service life will be longer. 1、the storage of the graphite crucible. The graphite crucible is easy to be wet,because it’s easy to absorb the moisture of in the air,so it’s better to store the crucible in a dry place,it should not be in the wet place. 2、Drying of crucible Before using each type of the crucible,it must be dry,and it should be put as bottom up display,the crucible…
Making graphite,SiC,clay,silicon powder etc.as the raw material to process the graphite SiC crucible,the below are some results about the oxidation resistance from different factors such as:the raw material constitution,firing temperature,the method of forming and the different coating on the surface. 1) The firing temperature has a big influence on the density,and the density will lead to the service life of the crucible. When the temperature reach 1150 centigrade,the porosity of the graphite-SiC crucible is the lowest,and the density is the best. 2) The content of the SiC is also very important to the oxidation resistance of the graphite crucible,with the content of the SiC increasing,the porosity of the crucible is reducing,and the performance of the oxidation resistance will be better.…
