99% Alumina Anti-Ballistic Ceramics: Nā Waiwai, Hana ʻana, a me nā Noi

ʻO ka99% alumina anti-ballistic ceramicHe keramika ʻenekinia hana kiʻekiʻe me ka α-alumina (α-Al2O₃) ma ke ʻano he pae crystalline mua a me ka nui o ka alumina ma mua o 98%. Ke noho nei i kahi kūlana koʻikoʻi i ka pale kaua pilikino a me ke kaʻa ma muli o kona paʻakikī kiʻekiʻe, ka density kaulike, ke kūpaʻa ʻana i ka ʻaʻahu maikaʻi loa, a me ka lakio hana kumukūʻai kūpono. Hilinaʻi nui kāna ʻano pale i kona paʻakikī kiʻekiʻe a me ka modulus e hoʻopololei a hoʻokaʻawale i ka projectile e hiki mai ana, ʻoiai e omo ana a hoʻopuehu ana i ka hapa nui o ka ikehu kinetic o ka projectile ma o kāna kaʻina hana haki ponoʻī. A laila hoʻomoʻa ʻia ka ikehu i koe e kahi mea hoʻohui kākoʻo (e laʻa, polyethylene kaumaha molekala ultra-kiʻekiʻe a i ʻole ka lole unidirectional). ʻO nā waiwai kino koʻikoʻi e pili ana i ka nui o ka nui ʻaʻole i emi ma mua o 3.9 g/cm³, ka paʻakikī Mohs o 9, ka ikaika flexural a hiki i 580 MPa, me ka omo wai haʻahaʻa (<0.006%) a me ke kūpaʻa wela maikaʻi.

Hoʻomaka ke kaʻina hana me ke koho ʻana i nā pauka alumina kiʻekiʻe-maʻemaʻe, ultra-fine, maʻamau me nā nui ʻāpana submicron (D50 a puni 0.35 ~ 1.4 μm). ʻO nā ʻano hana mua e pili ana i ke kaomi maloʻo a me ke kaomi isostatic, ukali ʻia e ka densification ma o ka sintering atmospheric a i ʻole ke kaomi wela. No ka lanakila ʻana i ka brittleness kūlohelohe o ka keramika a hoʻomaikaʻi i ke kū'ē ʻana i nā multi-hit, ke kālele nei ka noiʻi mua i nā ʻenehana toughening, e like me ka hoʻolauna ʻana i nā whiskers silicon carbide a i ʻole zirconia e hana i nā keramika composite matrix alumina. Hiki i kēia mau mea composite ke pale pono i ka laha ʻana o ka māwae ma ka pae microstructural, e hoʻonui nui ana i ka toughness, ke kū'ē ʻana i ka hopena, a me ka hana ballistic holoʻokoʻa.

I nā hana kūpono, hana pinepine ʻia nā keramika alumina 99% i nā tile ʻano maʻamau (nā huinahā, nā huinahā, nā hexagons) a i ʻole nā ​​ʻāpana ʻano kūikawā i ʻōwili ʻia e hōʻuluʻulu i nā papa hoʻokomo ballistic ergonomic. Ua hala nā papa pale kaua paʻakikī i hana ʻia mai kēia mea i nā hoʻokolohua ballistic ʻoihana e like me NIJ Standard-0101.06 Level III a me IV. Ua hōʻike nā haʻawina hoʻokolohua e hiki i ka hoʻohui ʻana i ka hoʻopaʻa ʻana i nā papa keramika ke hoʻomaikaʻi maikaʻi i ko lākou kūpaʻa i ke komo ʻana. Ma muli o kāna hana pale pōkā maikaʻi loa, ke kaumaha haʻahaʻa a me ke kumukūʻai hoʻokūkū, ua lilo ka keramika pale pōkā 99% alumina i mea nui ma ka mākeke papa pale pōkā keramika.