Menene Abubuwan Tasirin Juriya na Cire yumbu?
Wear{0}kayan yumbu masu juriya ana amfani da su sosai a fagen niƙa da kayan goge baki, sawa{1}rufin juriya, rufin bututu ko kayan aiki, da sassa na tsari, da sauransu, kuma lalacewarsu{3}}kayayyakin juriya kai tsaye suna ƙayyade rayuwar sabis na kayan aikin inji da sassa. Abubuwan yumbu masu juriya na yau da kullun sun haɗa da zirconia, alumina, cubic boron nitride, silicon nitride, boron carbide, silicon carbide, da sauransu.
Domin samun sawa{0}kayan yumbu masu juriya tare da ingantacciyar juriya, malamai da yawa sun yi nazarin tsarin lalacewa na yumbura da abubuwan da ke tasiri juriyar yumbura. Gabaɗaya magana, juriya na yumbu yana shafar abubuwa biyu, ɗaya shine tsarin kayan da kansa, ɗayan kuma abubuwan waje kamar kaya, zafin jiki, da yanayi.
Tasirin kaddarorin inji akan juriya na yumbu
A cikin binciken farko na sawa{0}}ƙayataccen kayan yumbu, an yi imanin cewa taurin yumbura yana da alaƙa ta kud da kud da kayan sawa. Daga baya an gano cewa alaƙar taurin kai da sa kayan yumbu ba a bayyane take ba. Misali, taurin yumbun alumina ya fi TZP zirconia tukwane, amma juriyar lalacewa ba lallai ba ne sama da tukwane na TZP.
Ko da yake taurin zai iya nuna ƙarfin haɗin kai na iyakar hatsi zuwa wani ɗan lokaci, lalacewa yana samuwa a ƙarshe saboda abin da ke wargajewa daga lalacewa, don haka taurin kayan yumbu ba a sake amfani da shi azaman ma'auni na tsinkaya don auna lalacewa. Wasu nazarin sun nuna cewa tare da haɓaka ƙarfin karyewa da taurin kayan, yawan lalacewa na yumbura ya ragu a hankali, kuma juriya na lalacewa ya fi kyau.
Tasirin microstructure akan juriya na yumbu
Gabaɗaya, ƙananan ƙananan kayan aiki sau da yawa yana da tasiri mai girma akan abubuwan macroscopic na kayan. Abun yumbu jiki ne da aka haɗe da hatsi da tsaka-tsakin crystal, kuma ƙananan tsarin sa sau da yawa yana ƙayyadaddun abubuwan macroscopic. Yawancin karatu sun nuna cewa juriya na kayan yumbura yana da alaƙa da girman ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar ƙwayar cuta, pores da sauran ƙananan ƙwayoyin cuta.
Girman hatsi
A cikin masana'antu, kayan ƙarfe na iya inganta kayan aikin su ta hanyar tsaftace hatsi, wanda ake kira ƙarfafa hatsi mai kyau. The main principle is that the smaller the grain size, the larger the area of grain boundary and the more zigzag the grain boundary distribution, which can effectively increase the crack growth path and is conducive to the stress concentration in the dispersed material. An gano cewa gyaran hatsi yana da wani tasiri akan juriya na kayan yumbura.
Porosity
Porosity yana da tasiri mai mahimmanci akan kaddarorin yumbu. Pore yana daidai da wanzuwar lahani, wanda zai haifar da ƙaddamarwa na damuwa, haɓaka haɓakar haɓakawa da rage ƙarfin haɗin kai tsakanin hatsi, don haka yana da matukar tasiri ga kayan aikin injiniya na yumbu. Karkashin aikin gogayya, pores na iya haɗawa da juna don samar da tushen tsagewa, wanda ke haɓaka lalacewa.
Tsarin iyaka na hatsi da ƙazanta na intercrystalline
Ceramics sun ƙunshi hatsi, matakan iyakokin hatsi, da pores. A cikin aiwatar da sintering, wasu additives da ƙazanta da aka kara wa yumbu sun fi zama a iyakar hatsi a cikin nau'i na "lokaci na biyu" ko "lokacin gilashi", kuma kasancewar su zai shafi ƙarfin haɗin kai tsakanin hatsi. A cikin yanayin juzu'in yumbu da lalacewa, fasa zai iya faruwa cikin sauƙi a iyakar hatsi. Ƙarfin haɗin kai na iyakoki na hatsi zai haifar da raguwa tare da hatsi a lokacin aikin lalacewa, wanda zai haifar da cirewa daga dukan hatsi kuma ya haifar da lalacewa mai tsanani.
Abubuwan ƙari na yumbu na polycrystalline yawanci yana kasancewa akan iyakar hatsi a cikin nau'in lokacin gilashi. A yayin aiwatar da gogayya, sakamakon babban zafin jiki yana rage dankowar gilashin, yana haifar da nakasar filastik. Idan damuwa na iyakar hatsin da ke kusa bai dace ba, zai haifar da tsagewa a iyakar hatsi kuma ya haifar da lalacewa mai tsanani.
Idan adadin abubuwan da suka dace na ƙarawa zai iya samar da lokaci na biyu a iyakar hatsi, yawanci yana da amfani ga juriya na kayan aiki. Alal misali, ƙara zirconia zuwa alumina don yin zirconia tauri alumina yumbu, wanda kuma aka sani da ZTA tukwane. Kamar yadda karuwar T -ZrO2 ya haifar da damuwa mai mahimmanci yana taimakawa wajen inganta ƙarfin karaya da ƙarfin kayan yumbura, zirconia da alumina na iya hana ci gaban hatsi da kuma cimma tasirin micro{4}crystallization dangane da microstructure, don ƙara inganta juriya.
