ʻĀpana
ʻO Polycrystalline Diamond Compact (PDC), i kapa ʻia he daimana composite, ua hoʻololi i ka ʻoihana mīkini kikoʻī ma muli o kona ʻano paʻakikī, kūpaʻa ʻaʻahu, a me ke kūpaʻa wela. Hāʻawi kēia pepa i kahi loiloi hohonu o nā waiwai waiwai o PDC, nā kaʻina hana, a me nā noi holomua i ka mīkini pololei. Hoʻopili ke kūkākūkā i kāna kuleana i ka ʻoki ʻana i ka wikiwiki, ka wili ultra-precision, micro-machining, a me ka hana ʻana i nā mea aerospace. Hoʻohui ʻia, ʻōlelo ʻia nā pilikia e like me ke kumukūʻai kiʻekiʻe a me ka brittleness, me nā ʻano o ka wā e hiki mai ana i ka ʻenehana PDC.
1. Hoʻolauna
Pono ka mīkini pololei i nā mea me ka ʻoi aku ka paʻakikī, ka lōʻihi, a me ke kūpaʻa wela e hoʻokō i ka pololei o ka micron-level. ʻO nā mea hana kuʻuna e like me ka tungsten carbide a me ke kila kiʻekiʻe e hāʻule pinepine i nā kūlana koʻikoʻi, e alakaʻi ana i ka lawe ʻana i nā mea holomua e like me Polycrystalline Diamond Compact (PDC). ʻO PDC, kahi mea i hoʻokumu ʻia i ke daimana synthetic, e hōʻike ana i ka hana like ʻole i ka hana ʻana i nā mea paʻakikī a palupalu, me nā ceramics, composites, a me nā kila paʻakikī.
Ke ʻimi nei kēia pepa i nā waiwai koʻikoʻi o PDC, kāna ʻenehana hana, a me kona hopena hoʻololi i ka mīkini pololei. Eia kekahi, ke nānā nei i nā pilikia o kēia manawa a me nā holomua e hiki mai ana i ka ʻenehana PDC.
2. Na waiwai waiwai o PDC
ʻO ka PDC kahi papa o polycrystalline daimana (PCD) i hoʻopaʻa ʻia i kahi substrate tungsten carbide ma lalo o nā kūlana kiʻekiʻe, wela kiʻekiʻe (HPHT). Loaʻa nā waiwai nui:
2.1 Paʻa loa a me ka pale ʻana i ka lole
ʻO Diamond ka mea paʻakikī loa i ʻike ʻia (Mohs hardness of 10), e hana ana i ka PDC i mea kūpono no ka mīkini ʻana i nā mea abrasive.
ʻO ke kūpaʻa ʻoi aku ka maikaʻi e hoʻolōʻihi i ke ola mea hana, e hōʻemi ana i ka manawa haʻahaʻa i ka mīkini pololei.
2.2 Kiʻekiʻe Thermal Conductivity
ʻO ka hoʻoheheʻe wela kūpono e pale i ka deformation thermal i ka wā o ka mīkini kiʻekiʻe.
Hoʻemi i ka ʻaʻahu o ka mea hana a hoʻomaikaʻi i ka pau ʻana o ka ʻili.
2.3 Paʻa Kemika
Kūleʻa i nā hopena kemika me nā mea ferrous a me nā mea hao ʻole.
Hoʻemi i ka hoʻohaʻahaʻa ʻana i nā mea hana ma nā wahi corrosive.
2.4 Haʻi ʻoʻoleʻa
Hoʻonui ka substrate tungsten carbide i ka hopena o ka hopena, e hōʻemi ana i ka chipping a me ka haki.
3. Ka Hana Hana o PDC
ʻO ka hana ʻana o PDC e pili ana i kekahi mau hana koʻikoʻi:
3.1 Hoʻohui ʻia ʻo Diamond Powder
Hoʻopuka ʻia nā ʻāpana daimana synthetic ma o ka HPHT a i ʻole ka chemical vapor deposition (CVD).
3.2 Kaʻina Sintering
Hoʻopili ʻia ka pauka daimana ma luna o kahi substrate tungsten carbide ma lalo o ke kaomi loa (5–7 GPa) a me ka mahana (1,400–1,600°C).
Hoʻoikaika ka mea hoʻoheheʻe metala (e laʻa, cobalt) i ka hoʻopaʻa ʻana i ke daimana me ke daimana.
3.3 Ma hope o ka hana
Hoʻohana ʻia ka laser a i ʻole ka uila hoʻolele machining (EDM) e hana i ka PDC i mea hana ʻoki.
Hoʻonui ka hoʻomaʻamaʻa ʻana i ka ʻili a hoʻemi i ke koena o ke kaumaha.
4. Nā noi i ka mīkini pololei
4.1 ʻOki wikiwiki kiʻekiʻe o nā mea non-ferrous
ʻOi aku ka maikaʻi o nā mea hana PDC i ka mīkini alumini, keleawe, a me ka carbon fiber composite.
Nā noi i loko o ka automotive (piston machining) a me ka uila (PCB milling).
4.2 ʻO ka wili ʻoi loa o nā ʻāpana Optical
Hoʻohana ʻia i ka lens a me ka hana aniani no nā lasers a me nā telescopes.
Loaʻa i ka ʻili o ka ʻili o ka sub-micron (Ra <0.01 µm).
4.3 Micro-Machining no nā Lapaʻau Lapaʻau
PDC micro-drills a me nā wili hope e hana i nā hiʻohiʻona paʻakikī i nā mea hana a me nā implants.
4.4 Mea Mīkini Hui Aerospace
ʻO ka hana ʻana i nā alloys titanium a me CFRP (carbon fiber-reinforced polymers) me ka liʻiliʻi o nā mea hana.
4.5 ʻO nā seramika kiʻekiʻe a me ka mīkini kila paʻakikī
PDC outperforms cubic boron nitride (CBN) i ka mīkini carbide silika a me tungsten carbide.
5. Nā pilikia a me nā palena
5.1 Nā Koina Hana Kiʻekiʻe
ʻO ka HPHT synthesis a me nā koina daimana e hoʻopaʻa i ka lawe ʻia ʻana.
5.2 Ka ʻoki ʻana i ka ʻoki ʻia
Hiki i nā mea hana PDC ke ʻokiʻoki i ka wā e hana ai i nā ʻāpana hoʻopau.
5.3 Hoʻohaʻahaʻa wela ma nā wela kiʻekiʻe
Hana ʻia ka graphitization ma luna o 700°C, e kaupalena ana i ka hoʻohana ʻana i ka mīkini maloʻo o nā mea ferrous.
5.4 Hoʻohālikelike palena ʻole me nā metala Ferrous
ʻO nā hopena kemika me ka hao ke alakaʻi i ka ʻaʻahu wikiwiki.
6. Nā ʻano a me nā mea hou e hiki mai ana
6.1 Nano-Structured PDC
ʻO ka hoʻohui ʻana i nā ʻanoʻano nano-diamond e hoʻonui i ka paʻakikī a me ke kūpaʻa ʻana.
6.2 Mea Hana PDC-CBN Hybrid
ʻO ka hui pū ʻana i ka PDC me ka cubic boron nitride (CBN) no ka mīkini metala ferrous.
6.3 Hoʻohui i nā mea hana PDC
Hiki i ka paʻi 3D ke hiki i nā geometries paʻakikī no nā hoʻonā mīkini maʻamau.
6.4 ʻO nā uhi kiʻekiʻe
Hoʻomaikaʻi hou ʻia nā uhi kalapona e like me Diamond (DLC) i ke ola o ka mea hana.
7. Ka hopena
Ua lilo ʻo PDC i mea koʻikoʻi i ka mīkini pololei, hāʻawi i ka hana like ʻole i ka ʻoki kiʻekiʻe kiʻekiʻe, ultra-precision grinding, a me ka micro-machining. ʻOiai nā pilikia e like me ke kumukūʻai kiʻekiʻe a me ka brittleness, hoʻohiki ka holomua o ka ʻepekema waiwai a me nā ʻenehana hana hana e hoʻonui hou aku i kāna mau noi. ʻO nā hana hou o ka wā e hiki mai ana, me ka nano-structured PDC a me nā hoʻolālā mea hana hybrid, e hoʻopaʻa i kāna kuleana i nā ʻenehana mīkini hana hou.
Ka manawa hoʻouna: Jul-07-2025
