Gịnị bụ elu Tg PCB osisi na uru nke iji elu Tg PCB

Mgbe okpomọkụ nke nnukwu Tg ebi ebi na-ebili n'otu ebe, mkpụrụ ga-agbanwe site na "glass steeti" na " roba steeti "na okpomọkụ n'oge a na-akpọ iko mgbanwe okpomọkụ (Tg) nke osisi.

N'ikwu ya n'ụzọ ọzọ, Tg bụ okpomọkụ kachasị elu (°C) nke mkpụrụ ahụ na-ejigidesi ike. Ya bụ, nkịtị PCB mkpụrụ ihe ọ bụghị nanị na-emepụta nro, deformation, agbaze na ndị ọzọ phenomena na elu okpomọkụ, ma na-egosi a nkọ ọdịda na n'ibu na eletriki e ji mara (m na-eche na ị na-achọghị ịhụ nke a na gị ngwaahịa) .

N'ozuzu, Tg efere dị n'elu 130 degrees, elu Tg na-adịkarị karịa 170 degrees, na ọkara Tg bụ banyere 150 degrees. Ọtụtụ mgbe, PCB ebi ebi osisi na Tg≥: 170 ℃ a na-akpọ elu Tg biri ebi osisi. A na-abawanye Tg nke mkpụrụ ahụ, a ga-eme ka ọ dịkwuo mma ma na-emeziwanye okpomọkụ na-eguzogide, mmiri na-eguzogide mmiri, nguzogide kemịkalụ, nkwụsi ike na njirimara ndị ọzọ nke bọọdụ a na-ebipụta. Ọnụ ahịa TG dị elu, ka mma na-eguzogide okpomọkụ nke osisi ahụ, karịsịa na usoro enweghị ndu, ebe ngwa Tg dị elu na-adịkarị. High Tg na-ezo aka na oke okpomọkụ.

Site na mmepe ngwa ngwa nke ụlọ ọrụ elektrọnik, ọkachasị ngwaahịa eletrọnịkị nke kọmpụta na-anọchi anya ya, mmepe nke arụmọrụ dị elu na ọtụtụ multilayers chọrọ nnukwu nguzogide ihe ọkụkụ nke PCB dị ka ihe dị mkpa na-ekwe nkwa.

Mwepụta na mmepe nke teknụzụ na-arị elu dị elu nke na-anọchi anya SMT.CMT mere ka PCB na-esiwanye ike na nkwado nke elu okpomọkụ na-eguzogide nke substrates na okwu nke obere oghere, mma sekit na thinning. Ya mere, ihe dị iche n'etiti general FR-4 na elu Tg FR-4: ọ bụ n'ibu ike, akụkụ kwụsie ike, adhesiveness, mmiri absorption, na thermal decomposition nke ihe n'okpuru na-ekpo ọkụ ala, karịsịa mgbe kpụ ọkụ n'ọnụ mgbe mmiri absorption. Enwere ọdịiche dị na ọnọdụ dị iche iche dị ka mgbasawanye ọkụ, ngwaahịa Tg dị elu doro anya karịa ihe mkpụrụ PCB nkịtị. N'ime afọ ndị na-adịbeghị anya, ọnụ ọgụgụ ndị ahịa na-achọ nnukwu akwụkwọ Tg e biri ebi abawanyela kwa afọ.