he aha ka tantalum carbide

Tantalum carbide (TaC)he mea kiʻekiʻe kiʻekiʻe wela me ke kiʻekiʻe kiʻekiʻe ke kūpaʻa, kiʻekiʻe kiʻekiʻe, kiʻekiʻe compactness; maʻemaʻe kiʻekiʻe, maʻiʻo haumia <5PPM; a me ka inertness kemika i ka amonia a me ka hydrogen i nā wela kiʻekiʻe, a me ka paʻa wela maikaʻi.

ʻO nā mea i kapa ʻia ʻo ultra-high temperature ceramics (UHTCs) e pili pinepine i kahi papa o nā mea seramika me kahi helu heheʻe ʻoi aku ma mua o 3000 ℃ a hoʻohana ʻia i nā wela kiʻekiʻe a me nā wahi corrosive (e like me ka oxygen atomic environments) ma luna o 2000 ℃, e like me ZrC, HfC, TaC, HfB2, ZrB2, HfN, etc.

Tantalum carbideHe wahi hehee a hiki i 3880 ℃, he kiʻekiʻe ka paʻakikī (Mohs hardness 9-10), nui thermal conductivity (22W·m-1·K-1), nui kulou ikaika (340-400MPa), a me ka liʻiliʻi thermal expansion coefficient (6.6×10-6K-1), a hōʻike i ke kūpaʻa thermochemical maikaʻi loa a me nā waiwai kino maikaʻi loa. Loaʻa iā ia ka hoʻopili kemika maikaʻi a me ka hoʻopili mechanical me ka graphite a me nā hui C/C. No laila,ʻO nā pale TaChoʻohana nui ʻia i ka pale wela aerospace, ka ulu ʻana o ka kristal hoʻokahi, ka uila uila, a me nā mea lapaʻau.

Tantalum carbide (TaC)he lālā o ka ʻohana ceramic ultra-high temperature!

Ke ulu nei nā mokulele hou e like me nā kaʻa aerospace, rockets, a me nā missiles i ke kiʻekiʻe kiʻekiʻe, kiʻekiʻe kiʻekiʻe, a me ke kiʻekiʻe kiʻekiʻe, ʻoi aku ka kiʻekiʻe o nā koi no ke kūpaʻa wela kiʻekiʻe a me ka pale ʻana o ka oxidation o kā lākou mau mea ma lalo o nā kūlana koʻikoʻi. Ke komo ka mokulele i ka lewa, e kū ana ia i nā kaiapuni koʻikoʻi e like me ke kiʻekiʻe o ka wela o ka wela, ke kaomi stagnation kiʻekiʻe, a me ka wikiwiki o ka holo ʻana o ka ea, a me ka ablation kemika ma muli o nā hopena me ka oxygen, ka mahu wai, a me ka carbon dioxide. Ke lele ka mokulele i waho a i loko o ka lewa, e hoʻopiʻi nui ʻia ka ea a puni kona ihu a me nā ʻēheu a hoʻohua i ka friction nui me ka ʻili o ka mokulele, e hoʻomehana ʻia kona ʻili e ka ea. Ma waho aʻe o ka hoʻomehana ʻana i ka aerodynamically i ka wā o ka lele ʻana, e hoʻopilikia ʻia ka ʻili o ka mokulele e ka radiation solar, radiation kaiapuni, etc. ʻO kēia hoʻololi e pili nui i ke kūlana lawelawe o ka mokulele.

ʻO ka pauka Tantalum carbide kahi lālā o ka ʻohana ceramic kūpaʻa kiʻekiʻe kiʻekiʻe. ʻO kona wahi hoʻoheheʻe kiʻekiʻe a me ke kūpaʻa thermodynamic maikaʻi loa e hoʻohana nui ʻia ʻo TaC i ka wela wela o ka mokulele, no ka laʻana, hiki iā ia ke pale i ka uhi ʻana o ka nozzle engine rocket.