Fused Silica Excellent thermal and Chemical Properties as Crucible Material
- Electro-quartz
- Fuskar quartz
- Fused silica dunƙule
Takaitaccen Bayani
Aikace-aikace
Fused Silica shine ingantaccen kayan da aka yi amfani da shi a cikin simintin saka hannun jari, refractories, tushen tushe, yumbu na fasaha, da sauran aikace-aikacen da ke buƙatar daidaito, samfur mai tsafta tare da ƙarancin haɓakar zafi.
| Haɗin Sinadari | Darasi na Farko | Na al'ada | Darasi na Biyu | Na al'ada |
| SiO2 | 99.9% min | 99.92 | 99.8% min | 99.84 |
| Fe2O3 | 50ppm max | 19 | 80ppm max | 50 |
| Farashin 2O3 | 100ppm max | 90 | 150ppm max | 120 |
| K2O | 30ppm max | 23 | 30ppm max | 25 |
Tsarin Samar da Hali
Fused Silica an yi shi ne daga silica mai tsafta, ta amfani da fasahar fusion na musamman don tabbatar da inganci mafi girma.Silica ɗinmu Fused ya wuce 99% amorphous kuma yana da ƙarancin ƙarancin haɓakar haɓakar zafi da babban juriya ga girgiza zafi.Fused Silica ba shi da ƙarfi, yana da kyakkyawan kwanciyar hankali na sinadarai, kuma yana da ƙarancin ƙarancin wutar lantarki.
Fused ma'adini yana da kyau kwarai thermal da sinadarai Properties a matsayin crucible abu don guda crystal girma daga narkewa, da kuma high tsarki da kuma low cost sa shi musamman m ga ci gaban high-tsarki lu'ulu'u.Amma, a cikin ci gaban wasu nau'in lu'ulu'u, a Layer na pyrolytic carbon shafi ake bukata tsakanin narke da ma'adini crucible.
Mabuɗin Abubuwan Silica Fused
Fused silica yana da abubuwa masu ban mamaki da yawa duka game da injina, thermal, sunadarai da kaddarorin gani:
• Yana da wuya kuma mai ƙarfi, kuma ba shi da wahala sosai don na'ura da goge baki.(Mutum kuma yana iya amfani da micromachining laser.)
• Maɗaukakin zafin canjin gilashin yana sa ya fi wahala narke fiye da sauran tabarau na gani, amma kuma yana nuna cewa yanayin zafi mai girma yana yiwuwa.Koyaya, fused silica na iya nuna ɓarna (kristalization na gida a cikin nau'in cristobalite) sama da 1100 ° C, musamman a ƙarƙashin tasirin wasu ƙazantattun abubuwa, kuma wannan zai lalata abubuwan gani.
• Ƙimar haɓakar haɓakar thermal yana da ƙananan ƙananan - game da 0.5 · 10-6 K-1.Wannan ya ninka sau da yawa ƙasa fiye da na tabarau na yau da kullun.Ko da mafi ƙarancin haɓakar thermal a kusa da 10-8 K-1 yana yiwuwa tare da gyare-gyaren nau'i na silica mai haɗaka tare da wasu titanium dioxide, wanda Corning [4] ya gabatar kuma ana kiransa gilashin fadada ƙananan ƙananan.
• Babban ƙarfin juriya na thermal shine sakamakon raunin haɓakar thermal mai rauni;akwai matsakaicin matsananciyar damuwa na inji ko da lokacin da babban zafin jiki gradients ya faru saboda saurin sanyaya.
• Silica na iya zama tsaftar sinadarai, ya danganta da hanyar ƙirƙira (duba ƙasa).
• Silica ba ta da ƙarfi sosai, ban da hydrofluoric acid da maganin alkaline mai ƙarfi.A yanayin zafi mai tsayi, yana da ɗan narkewa a cikin ruwa (mafi yawa fiye da ma'adini na crystalline).
• Yankin nuna gaskiya yana da faɗi sosai (kimanin 0.18 μm zuwa 3 μm), yana ba da damar yin amfani da siliki da aka haɗa ba kawai a cikin cikakken yanki na gani ba, har ma a cikin ultraviolet da infrared.Koyaya, iyakokin sun dogara sosai akan ingancin kayan.Misali, makada mai ƙarfi na infrared na iya haifar da abun ciki na OH, da kuma ɗaukar UV daga ƙazantattun ƙarfe (duba ƙasa).
• A matsayin kayan amorphous, fused silica is optically isotropic - sabanin ma'adini crystalline.Wannan yana nuna cewa ba shi da birefringance, kuma fihirisa mai jujjuyawa (duba Hoto 1) ana iya siffanta shi da tsarin Sellmeier guda ɗaya.
