Activation Mechanism and Infiltration Kinetic for Pressureless Melt Infiltration of Ti Activated Al2O3 Preforms by High Melting Alloy
Activation Mechanism and Infiltration Kinetic for Pressureless Melt Infiltration of Ti Activated Al2O3 Preforms by High Melting Alloy
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高熔点合金无压熔渗Ti活化Al2O3预制件的活化机理及熔渗动力学
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
T. Graule
中科院分区：
文献类型：
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作者：
Srdan Vasić;B. Grobéty;J. Kuebler;T. Graule
研究了X3 CrNi 13 -4在钛活化多孔氧化铝预制体中的浸渗机理。调查显示，在渗透前沿之外有孤立的钢覆盖的钛颗粒。钢形成这种润湿岛的唯一可能的传输路径是通过气相。由于钢气相与富钛气相在活化剂颗粒表面上的混合而产生的过饱和被认为是冷凝机理。在非润湿X3 CrNi 13 -4/Ti-Al 2 O3系统中，逐渐冷凝导致形成熔体网络，作为原始钢熔体渗透预制件并填充剩余孔隙空间的通道。
The infiltration mechanism of X3CrNi13-4 in titanium activated porous alumina preforms has been studied. Investigations revealed isolated steel-covered titanium particles beyond the infiltration front. The only transport path possible for the steel to form such wetted islands is through the gas phase. Supersaturation due to the mixing of the steel gas phase with the titanium rich gas phase over the activator particle surfaces is proposed as condensation mechanism. Progressive condensation leads to the formation of a melt network, which serves as pathway for the original steel melt to infiltrate the preforms and to fill the remaining pore space in the non-wetting X3CrNi13-4/Ti-Al 2 O 3 sytem.