アルミニウムイソプロポキシド溶液とSi_3N_4粉末の相互作用

概要

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The dispensability of Si_3N_4 powder in n-C_6H_<14> and Al( Oi-Pr)_3/n-C_6H_<14>, and the amount of Al( Oi-Pr)_3 adsorbed on thesur face of Si_3N_4 particles after mixing Al(Oi-Pr) _3/n- C_6H_<14> and Si_3N_4 were examined. The zeta-potential of the powder pre-pared by spray-drying and calcining a mixture of Al(Oi-Pr)_3/n- C_6H_<14>, and Si_3N_4 was measured. The dispensability of Si_3N_4 in Al(Oi-Pr)_3/n- C_6H_<14>, was much higher than in n- C_6H_<14>, due to the formation of-Al( Oi-Pr)_n layer on Si_3N_4 particle surfaces. The Si_3N_4 powder which was separated from the mixture of Al(Oi-Pr)_3/n- C_6H_<14> and Si_3N_4 by filtration after hydrolysis by addition of water and peptization by addition of diluted HCI at pH 2, contained 0.07 wt% Al. The isoelectric point of the powder which was prepared by spray-drying and calcining the mixture of Al(Oi-Pr)_3/n- C_6H_<14> and Si_3N_4 was about 8.2, while that of Si_3N_4 was 5.5. These results suggested that Si_3N_4 particles were coated with a γ-Al_2O_3- like layer.
社団法人日本セラミックス協会の論文
1988-06-01