Ka hopena o ka hana cryogenic i ka microstructure o ka carbide cemented

Hoʻololi nā kaʻina cryogenic like ʻole i nā waiwai ocarbide sima, a pili loa nā hoʻololi i nā waiwai i ka hoʻomohala ʻana o kāna microstructure.No laila, pono e nānā hou i ka mana o ka mālama cryogenic i ka microstructure o ka carbide cemented.

ʻO ka microstructure maʻamau o WC-Co cemented carbide penei: kahi pae - WC (paʻakikī paʻakikī);pae β - Co (binder phase);y pae - (TaC, TiC, NbC, WC) equicubic lattice hui pu ia;eta phase-decarburized pae (CoW, C, Co. W. C).ʻO Gill et al.ua hāʻawi i kahi kiʻikuhi schematic o ka a me ka β, e like me ka mea i hōʻike ʻia ma ke Kiʻi 6. Ma waena o lākou, ʻo ka α phase-WC (paʻakikī paʻakikī) noho i ka hapa nui o kamea carbide simama ke ʻano o ka iwi iwi ʻoʻoleʻa, ʻoiai ʻo ka β phase-Co (binder phase) e pili pono ana me ka tungsten carbide (WC) e like me ka grid.

Ke hoʻomaloʻo ʻia ka carbide i hoʻopaʻa ʻia ma hope o ka sintering ʻana, no ka mea ua hoʻoheheʻe ʻia ka nui o W a me C i Co, ʻo ka pae wela kiʻekiʻe ʻo α-Co i ka lumi wela e mau ana.Ke hoʻomau nei ka emi ʻana o ka mahana, hiki ke hoʻololi ʻia ka māhele martensitic mai ka cubic α-Co i hoʻopaʻa ʻia hexagonal ε-Co i loko o ka pae hoʻopili -Co.Hiki ke ʻike ʻia i ka wā e hoʻololi ai ka mahana, aia nā loli i ka microstructure ocarbide sima, e hāʻawi ana i ka hiki ke mālama cryogenic e paipai i ka hoʻololi ʻana o ka pae ocarbide sima.Nui nā haʻawina i kālele i nā loli i ka microstructure ocarbide simama mua a ma hope o ka mālama ʻana i ka cryogenic a ʻimi i ka mīkini hoʻololi microscopic i ka wā e loli ai nā waiwai macroscopic.