论文部分内容阅读
气泡或针孔的生长也是一个成核和长大过程。影响气泡形成的条件是成核,表面张力和气体含量。气泡在液体金属中成核的条件是:P=P_o+(2б)/r(其中P—半径为r的气泡内部的气体压力,P_o—大气静压力和铁水静压头,б—气液相间表面张力,r—气泡半径)。所以即使在过饱和的溶液中也不可能靠溶解的气体本身去建立足够的均匀成核压力。通常认为气泡是在固液相内表面上存在的一种微观气体薄膜上形成的。从公式也可看出,要形成一定尺
Bubble or pinhole growth is also a nucleation and growth process. The conditions that affect bubble formation are nucleation, surface tension and gas content. P = P_o + (2б) / r (where P-radius r is the gas pressure inside the bubble, P_o- atmospheric static pressure and hydrostatic head, б-gas-liquid phase Surface tension, r-bubble radius). It is not possible to establish sufficient homogeneous nucleation pressure by the dissolved gas itself even in supersaturated solutions. Bubbles are generally thought to form on a micro-gas film present on the inner surface of a solid-liquid phase. Can also be seen from the formula, to form a certain size