ガラスの熔融過程における泡の形成と成長

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Formation and growth of bubbles were treated as a "phase transition" phenomenon, in which the nuclei of gas bubbles were formed in a supersaturated solutiond and then were grown through gas diffusion. The theoretical equations giving the rate of nucleation and of the growth of bubbles were derived in the forms J = Kexp[-1/(kT){U_1 + 16πσ^3/3((1-lnc/c_o)/(plnc/c_0))^2}], representing the rate of nucleation, and I=K'exp{-1/(kT)(U_1'+(πσ'^2)/σ (1-2lnc/c_0)/(plnc/c_0))} representing the rate of the growsh of bubbles. In the equation U_l and U_1' are the activa-tion energies of gas diffusion, σ, σ' the interfacial energies between solution and bubble, where dashes refer to two-dimensional growth, c, c_0 are respectively, the concentrations of dissolved gas in the liquid and p is the external atomospheric pressure and δ the thickness of gas film. The rate of the growth of bubbles in the supersaturated solution dissolving C0_2 in water and in glycerin was measured with results showing the good applicability of the second equation. The average diameter of bubbles in molten BK 7 glass increased at the initial stage of melting, which decresed again after passing through a maximum showing the existence of the growth of bubbles in glass melting processes. The rate of decrease of bubbles in the melt from the batch containing the component liberating gases is faster than in the case of cullet melting. Agitation, which increases the rate of diffusion also accelerated the rate of growth of bubbles. All these facts prove the soundness of the postulated theoretical equations. [Received December 6,196l]
社団法人日本セラミックス協会の論文
1962-07-01

ガラスの熔融過程における泡の形成と成長

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