I ka ʻulaʻula mua, ʻo ka paʻakikī a me ka paʻakikī paha e like me nā manaʻo hoʻololi, akā aia lākou ma nā ʻaoʻao ʻē aʻe o kahi continuum e wehewehe ana i ka hoʻokomo kuhikuhi ʻia a me ka hana ʻoki paʻa paʻa, ʻoiai ke pili i nā hoʻokomo carbide. Hāʻawi nā mea hoʻokomo paʻa i ke kūpaʻa aahu no ka hoʻonui ʻana i ka hana a me ke ola mea hana ma nā wahi ʻoki wela ma mua o nā mea hoʻokomo palupalu, akā hiki i nā mea hoʻokomo paʻakikī ke pale i nā hopena a me nā pilikia e loaʻa ai nā helu hānai kiʻekiʻe a me nā DOC.

No kēlā me kēia noi i hāʻawi ʻia, aia kahi kaulike maikaʻi loa o ka paʻakikī a me ka paʻakikī - a ua hana ikaika nā mea hana e hoʻokumu i nā loina metallurgical a hāʻawi i nā ʻano mea hana e hiki ke hoʻokō i nā pono like ʻole o nā mea hana ʻāpana.

Hōʻike ka paʻakikī i ka pale ʻana i ka ʻaʻahu, ʻo ia ka mea hiki i kahi mea hana ke kū i ka wela i ka wā e ʻoki ʻia ai. ʻO ka pālākiō Rockwell A e ana i ka paʻakikī o ka tungsten carbide, ʻoiai ua unuhi kekahi mau kikoʻī i nā waiwai HRA i ka unahi HRC maʻa loa i hoʻohana ʻia no ke ana ʻana i ka paʻakikī o ke kila a me nā mea hao ʻē aʻe. ʻO ke kūpaʻa wela e pili ana me ka paʻakikī ke hana nui i ka ʻoki ʻana i ka ʻano hana a me ke koho ʻana.