分相ガラスの酸処理における多孔質層の形成速度
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概要
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The acid treatment of phase-separated glass was studied. The rate of porous layer formation was chemical reaction-controlling in the early stage. After the porous layer was slightly formed, it came to depend on both the dissolution reaction and the diffusion of acid. This reaction rate was proportional to the square root of acid concentration.<BR>The increase of porous layer thickness was successfully explained by the pseudo steady-state diffusion approximation, and effective diffusion coefficient of acid was determined as follows.<BR>D<I>eff</I>=5.71×10<SUP>-4</SUP>exp (-4, 530/<I>RT</I>) [cm<SUP>2</SUP>/sec] <BR>It can be considered that <I>D<SUB>eff</SUB></I> is influenced by two causes. They are (1) the filling in of pores by boric products and (2) the tortuosity of the porous layer. In this connection, the pore structure of porous glass at various leaching times was examined by nitrogen adsorption experiments.
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