Magnesia-stabilized zirconia (MSZ) muaj kev tiv thaiv zoo dua rau kev yaig thiab thermal shock. Me me tetragonal theem precipitates tsim nyob rau hauv lub cubic theem nplej ntawm transformation-toughened zirconias zoo li magnesium-stabilized zirconia. Thaum ib qho tawg ua kom txav mus los ntawm cov khoom siv, cov precipitates hloov los ntawm meta-stable tetragonal theem mus rau theem ruaj khov monoclinic. Lub precipitate enlarges raws li qhov tshwm sim, blunting qhov tawg taw tes thiab nce toughness. Vim muaj kev hloov pauv ntawm cov khoom siv raw li cas, MSZ tuaj yeem yog cov kaus ntxhw lossis daj-txiv kab ntxwv xim. MSZ, uas yog ivory nyob rau hauv cov xim, yog purer thiab muaj me ntsis superior mechanical zoo. Hauv qhov kub thiab txias (220 ° C thiab siab dua) thiab qhov chaw noo noo siab, MSZ ruaj khov dua li YTZP, thiab YTZP feem ntau degrades. Tsis tas li ntawd, MSZ muaj cov thermal conductivity tsawg thiab CTE zoo ib yam li cam khwb cia hlau, tiv thaiv thermal mismatch hauv ceramic-rau-hlau systems.
Cov khoom
High mechanical zog
Siab tawg toughness
Kub kub kuj
Siab hnav tsis kam
Kev tiv thaiv siab
Zoo thermal shock tsis kam
Tsis tshua muaj thermal conductivity
Thermal expansion yog haum rau ceramic-rau-hlau sib dhos
High chemical resistance (acids thiab bases)
Daim ntawv thov
Magnesia-stabilized zirconia tuaj yeem siv rau hauv li qub, twj, thiab gaskets vim nws muaj kev hnav zoo heev thiab kev tiv thaiv corrosion. Nws tseem yog cov khoom siv zoo tshaj plaws rau cov khoom siv petrochemical thiab tshuaj ua haujlwm. Zirconia ceramics yog qhov kev xaiv zoo rau ntau qhov chaw, suav nrog:
Cov qauv ceramics
Cov kabmob
Hnav qhov chaw
Hnav lub tes tsho
Txau nozzles
Lub tes tsho
Txau pistons
Bushings
Khoom oxide roj cell qhov chaw
MWD tools
Cov menyuam cov lus qhia rau kev ua lub raj
Sib sib zog nqus zoo, downhole qhov chaw
Magnesia-Stabilized Zirconia Machining
Nyob rau hauv nws ntsuab, biscuit, los yog tag nrho cov ntom ntom, MSZ tuaj yeem ua tshuab. Thaum nws nyob rau hauv daim ntawv ntsuab los yog biscuit, nws yuav raug machined rau hauv intricate geometry yooj yim heev. Lub cev zirconia shrinks los ntawm ib ncig ntawm 20% thaum lub sij hawm sintering txheej txheem, uas yog tsim nyog kom txaus densify cov ntaub ntawv. Vim qhov no shrinkage, zirconia pre-sintering tsis tuaj yeem machined nrog zoo heev kam rau ua. Cov khoom siv sintered tag nrho yuav tsum tau machined los yog honed nrog cov cuab yeej pob zeb diamond thiaj li yuav ua tau nruj heev. Hauv cov txheej txheem tsim khoom no, cov khoom siv hauv av los ntawm kev siv cov cuab yeej pob zeb diamond-coated zoo heev lossis lub log kom txog rau thaum daim ntawv xav tau tiav. Qhov no tuaj yeem yog lub sijhawm siv sijhawm thiab kim txheej txheem vim tias cov khoom siv los ntawm qhov toughness thiab hardness.
