カオリナイトと塩基性炭酸マグネシウムからのコーディエライトの合成と焼結

概要

論文の詳細を見る
Sintering behavior of the mixtures of kaolinite and basic magnesium carbonate(BMC)was investigated to obtain dense cordierite ceramics. Kaolinite and BMC were mixed by ball-milling in a molar ratio of nMgO・Al_2O_3・2SiO_2(n=0.8-1.4). Particularly fine mixtures were prepared by beads-milling after calcination. During firing of fine mixtures, magnesia disappeared completely by reaction with metakaolin to form amorphous particles below 900℃. Since the amorphous particles were very sinterable, the pressed specimens were densified up to about 90% at 900℃, and then μ-cordierite crystallized at about 940℃. Dense α-cordierite ceramics with relative density of ≩95% were obtained at 1300℃ from the mixtures of n=1.0-1.4, and the lowest linear thermal expansion coefficient was 2.2×10^<-6>/K in the case of n=1.0, which is close to the composition of cordierite.
社団法人日本セラミックス協会の論文
1998-01-01