The
white alumina abrasives made with
vitrified bond may show red in white,red -yellow or celadon-gray. This will influence
on the appearance quality of the products seriously. Through considerations of the raw materials of
white alumina abrasives and burnt - in - atmosphere and so on, this paper discusses the factors that influence the color and change the luster, thus put forward some measures of preventing the color and luster of white aluminua abrasives from changing. Through theoretical analysis and a great number of experiments , the following main conclusions can be drawn .①The change of the color and luster is determined by the content of the impurity of bond and burnt -in -atmosphere. If it is sintered in oxidizing atmosphere and the contents of titanium oxide and ferric oxide is less than 55% , the white alumina abrasives won' t show red - yellow. With the increasing of contents of titanium oxide and ferric oxide in bond , the white alumina abrasives can be aggravated gradually in color of red, red - yellow . Therefore, if the contents of titanium oxide and ferric oxide in bond is more than 55% , the white alumina abrasives can not be sintered in the oxidizing atmosphere other than in the neutral atmosphere, or in weak oxidizing atmosphere . ②Addition of the powders of talc, quartz and magnesium oxide to vilified bond, red color of white alumina abrasives can be avoid , but in the meanwhile the strength of the abrasives can be influenced.