Kodi njerwa ya mullite insulator ndi ndalama zingati?

Mitundu ya JM ya njerwa zotsekereza za mullite zili ndi JM26, JM28, JM30, JM32 malinga ndi kutentha kwa ntchito. Mtengo wamsika wa chidutswa chilichonse ndi ma yuan angapo pa yuan. Mtengo udzasinthasintha malinga ndi zomwe zili mu zizindikiro zosiyanasiyana komanso zofunikira. Za mullite Pankhani yokhudzana ndi kuchuluka kwa njerwa yotsekera, mtengo wake uyenera kuganiziridwa pamodzi mutakambirana ndi wopanga zotchinga.

Mullite kutchinjiriza njerwa ndi mkulu aluminiyamu refractory zinthu ndi mullite (3Al2O3 · 2SiO2) monga gawo lalikulu galasi. Nthawi zambiri, zokhala ndi aluminiyamu zimakhala pakati pa 65% ndi 75%. Kuphatikiza pa mullite, kapangidwe ka mchere kamakhala ndi gawo laling’ono la galasi ndi cristobalite yokhala ndi aluminiyamu yotsika; zinthu zapamwamba za alumina zimakhalanso ndi kachulukidwe kakang’ono ka corundum. Njerwa zosungunulira mullite zitha kugwiritsidwa ntchito mwachindunji pakuyatsa ng’anjo zotentha kwambiri, ndipo zakhala zikugwiritsidwa ntchito kwambiri m’makina otenthetsera, mawotchi odzigudubuza, magalasi ndi ma petrochemical kilns.

1. Makhalidwe azinthu za njerwa zotchinjiriza za mullite:

1. Low matenthedwe madutsidwe ndi zabwino matenthedwe kutchinjiriza zotsatira;

2. Low zonyansa zili ndi otsika kwambiri chitsulo bokosi alkali zitsulo ndi ena okusayidi zili, choncho, mkulu refractoriness; aluminiyumu yapamwamba imapangitsa kuti ikhalebe yogwira ntchito bwino mumlengalenga wochepetsera;

3. Njerwa yotsekera mullite imakhala ndi kusungunuka kochepa. Chifukwa chotsika matenthedwe madutsidwe, mndandanda wa mullite wa opepuka kutchinjiriza njerwa kudziunjikira pang’ono kutentha mphamvu, ndi mphamvu yopulumutsa mphamvu ndi zoonekeratu ntchito yapakatikati;

4. Maonekedwe kukula, kufulumizitsa zomangamanga, kuchepetsa kuchuluka kwa matope refractory, kuonetsetsa mphamvu ndi kukhazikika kwa zomangamanga, potero kuwonjezera moyo akalowa;

5. Njerwa zotchinjiriza za mullite zimakhala ndi mphamvu zopondereza zotentha kwambiri;

6. Njerwa zotsekera mullite zimatha kusinthidwa kukhala mawonekedwe apadera kuti achepetse kuchuluka kwa njerwa ndi zolumikizira.

2. Gulu la njerwa za mullite insulation:

Malinga ndi momwe amapangira, pali mitundu iwiri ya njerwa za mullite zopepuka: njerwa za sintered mullite ndi njerwa zosakanikirana za mullite:

1. Njerwa za sintered mullite zimapangidwa ndi aluminiyamu yapamwamba ya bauxite clinker monga zopangira zazikulu, kuwonjezera pang’ono dongo kapena bauxite yaiwisi monga chomangira, ndi kupanga ndi kuwombera.

2. Njerwa zophatikizika za mullite zimapangidwa ndi aluminiyamu wapamwamba, aluminiyamu ya mafakitale ndi dongo losasunthika ngati zopangira, komanso tinthu tating’ono ta makala kapena coke timawonjezedwa ngati othandizira. Pambuyo poumba, amapangidwa ndi kuchepetsa kusungunuka kwa magetsi.

Ntchito ndi ntchito mullite kutchinjiriza njerwa: mkulu refractoriness, amene akhoza kufika pamwamba 1790 ℃. Kutentha koyambira kwa kufewetsa katundu ndi 1600 ~ 1700 ℃. Kuphatikizika kwamphamvu kutentha kwachipinda ndi 70 ~ 260MPa. Kukaniza kwamphamvu kwamafuta. Pali mitundu iwiri ya njerwa za sintered mullite ndi njerwa zosakanikirana za mullite. Njerwa za sintered mullite zimapangidwa ndi aluminiyamu yapamwamba kwambiri ya bauxite clinker monga zopangira zazikulu, kuwonjezera pang’ono dongo kapena bauxite yaiwisi monga binder, ndi kupanga ndi kuwombera. Njerwa zophatikizika za mullite zimagwiritsa ntchito aluminiyamu yayikulu, aluminiyamu yamafakitale ndi dongo lotayirira ngati zopangira, kuwonjezera makala kapena tinthu tating’onoting’ono ta coke ngati zochepetsera, ndipo amapangidwa ndi njira yochepetsera yophatikizika pambuyo pakuwumba. Kusungunuka kwa mullite wosakanikirana ndikwambiri kuposa kwa sintered mullite, ndipo kukana kwake kutenthedwa kwa kutentha kumakhala bwino kuposa kwazinthu zopangira sintered. Kutentha kwawo kwakukulu kumadalira zomwe zili ndi alumina ndi kufanana kwa gawo la mullite ndi kugawa kwagalasi. Amagwiritsidwa ntchito kwambiri popangira chitofu chowotcha pamwamba, ng’anjo yoyaka moto ndi pansi, chopangiranso ng’anjo yosungunuka yamagalasi, ng’anjo ya ceramic sintering, ng’anjo yakufa pamakona amafuta amafuta, ndi zina zambiri.