He aha ka ʻokoʻa ma waena o ka reaction bonding a me ka sintered silicon carbide?

I ka wā e pili ana i nā keramika silicon carbide, aia ʻelua mau ʻano nui:ka hopena i hoʻopaʻa ʻia ka silicon carbidea me ka silicon carbide sintered. ʻOiai ʻo nā ʻano keramika ʻelua e hāʻawi i nā pae kiʻekiʻe o ka paʻa a me ke kūpaʻa ʻana i ka ʻaʻahu, aia kekahi mau ʻokoʻa koʻikoʻi ma waena o nā mea ʻelua.

E hoʻomaka kākou me nā keramika silicon carbide i hoʻopaʻa ʻia me ka hopena. Aia kēia mau keramika ma waena o 85% a me 90% silicon carbide a loaʻa iā lākou kekahi silicon. ʻO ko lākou kūpaʻa wela kiʻekiʻe loa he 1380°C. ʻO kekahi o nā pono nui o nā keramika silicon carbide i hoʻopaʻa ʻia me ka hopena, hiki ke hoʻopilikino ʻia i nā nui a me nā ʻano nui. ʻO kēia ka mea e lilo ai lākou i mau mea kūpono no ka hana ʻana i nā huahana kū hoʻokahi a ʻoihana. Eia kekahi, ʻo ka coefficient haʻahaʻa o ka hoʻonui ʻana a me ke kūpaʻa ʻana o ka ʻaʻahu maikaʻi loa o kēia mau keramika e lilo ai lākou i koho kaulana i ka ʻoihana cyclone mining.

ʻOi aku ka nui o ka silicon carbide o ka silicon carbide sintered pressureless, hiki ke piʻi ma mua o 99%, a ʻo ke kūpaʻa wela kiʻekiʻe loa he 1650°C. Hoʻokomo ʻia kahi coefficient o ka hoʻonui ʻana i ka wā o ke kaʻina hana sintering, ka mea e kūpono ai ka sintered SiC pressureless no ka hana ʻana i nā ʻāpana SiC kikoʻī. Ma muli o kona kikoʻī kiʻekiʻe, hoʻohana pinepine ʻia ka sintered silicon carbide pressureless e hana i nā ʻōmole a me nā ʻāpana kikoʻī pale ʻaʻahu.

Ma waho aʻe o nā ʻōmole kikoʻī a me nā ʻāpana ʻaʻahu, hiki i nā lako umu kiʻekiʻe no ka ʻoihana kemika ke hoʻohana i ka pale ʻana i ka mahana kiʻekiʻe o ka silicon carbide sintered pressureless. No ka poʻe e ʻimi nei i nā paipu hoʻololi wela kūpono no kā lākou lako hana kemika, ʻo ka silicon carbide sintered pressureless he koho mea kūpono ia.

Ma keʻano laulā, ʻo ka hoʻopili ʻana i ka hopena a me ka sintering pressureless o nā keramika SiC, ʻoiai he mau pono a me nā hemahema ko kēlā me kēia, kūpono ia no nā ʻoihana a me nā noi like ʻole. Inā makemake ʻoe i kahi huahana kū hoʻokahi a nui paha e hiki ke kū i ka ʻaʻahu, ʻo nā keramika silicon carbide i hoʻopili ʻia i ka hopena ke koho kūpono nāu. No nā ʻāpana palupalu e pono ai ke kū i nā mahana kiʻekiʻe, ʻoi aku ka maikaʻi o ka koho silicon carbide sintered pressureless. ʻAʻohe mea ke ʻano o ka keramika silicon carbide āu e koho ai, hiki iā ʻoe ke hilinaʻi e hāʻawi ia i ka lōʻihi a me ka hoʻomau e pono ai kāu papahana.