EFFECTS OF MODIFICATION OF GLASSY PHASE COMPOSITION ON SINTERING TEMPERATURE OF SANITARYWARE

In this study, the effect of glassy phase viscosity and chemical composition of sanitaryware body was investigated. additionally, the effects of these parameters on the sintering temperature were researched. the amount of mullite, quartz and glassy phases were estimated by slope ratio method, as 18.8 %, 22.1 % and 59.1 %, respectively. the alternative glassy phase compositions which are enhanced at low temperatures were calculated starting from glassy phase chemical composition, determined in body of sanitaryware. in this section, different na2o/k2o, al2o3/si2o and sum of them, different cao/mgo ratios were researched to determine the best composition. the melting behaviors of prepared compositions were analyzed by heat microscope. the glassy phase compositions (s0.3-1, s2t0.8, s2t0.8-1 and s2t2) which are showed that melting behavior at low temperature, were used in preparation of body recipe. as a result, the composition (s2t2) with the ratio of na2o/k2o (2.5-3.0), al2o3/sio2 (6.0-6.5), na2o+k2o (0.6-0.7) and al2o3+sio2 (5.0-6.0) was sintered at 80°c lower temperature than that of standard composition (std).