The Preparation And Research Of Magnesia Porcelain

The e xperi me nt on the ba sis of M g O-Al2O3-Si O2a ndK2O-Al2O3-Si O2the ter nar y phase di agram， as the raw material ofGuangxi t alc,Quji n g cla y and Hubei potassiu m fe ldspar a s t he mai n r a wma terial,through orthogonal experi me nt design,selection of ma gnesiapor celai n best re cipe,preparati on of t he excelle nt per for ma nc e ofmagnesi a porcelai n,t echnical i ndi cat ors: Plasticity i n d e x i s12.75,sinte ring te mpe rat ure ra nge of1180℃~1260℃, bibulous rate less than0.5%, resistance to bendi ng strength is72.85M Pa~126.98M Pa, t h e r male x p a n s i o n c o e ff i c ient of5.58x10-6k-1(20℃~800℃). Wh e n t h e s i n t e r i n gt e mpe r a t u r e i s1240℃, w h i t e n e s s82.6(Ox i d i z ing fla me). Commonlyused di spersant in the mud of zet a pote ntial me as ure ment, for s odi u msilicat e se lecte d dis pers ant, dosa ge of0.35%.By XRD，SEM and other analytical means such as routine test, the resultsshowed that: With the increase of temperature, the bending strength increasesconstantly, crystal gradually formed with the protoenstatite-cordierite as themain the main crystal phase; Calcining at Low temperature, the samples ofstomatal more, but smaller,but calcining at high temperature, less porosityceramics, but large, high temperature firing of porcelain body main crystalphase is dense, uniform grain size distribution. The microstructure makesceramic has good density and high strength.In order to suppress the protoenstatite crystalline type conversion, theintroduction of a small amount of BaCO3in the formula. XRD results showthat, the introduction of a small amount of BaCO3, make the winner of theprotoenstatite occupy the main peak, content is increased; SEM morphologyshows, protoenstatite wrapped around a layer of glass phase, inhibits theconversion of the protoenstatite, improve the porcelain blank bending strength,growth of around15%. Different ball milling time, the size of the grain is not,powder is fine, the smaller the grain size, flexural strength also increasedaccordingly.Through the distribution of the characteristics of glaze type, the design oforthogonal test,successful preparation of transparent glaze, when the sinteringtemperature of1240℃, Gloss is94.5, Glazed white degree of82.2.