Глинозем/циркониевая керамическая резьба гайка болт/керамический изолятор

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STA ceramic screw


 


 


Ceramic Screws and nuts are used in applications where conventional metal or plastic components will not work.Ceramic screws and nuts are strong, rigid, non-magnetic and operate at high temperature and in corrosive environments


Alumina is the most well known ceramic material, alumina has superior electric insulation, wear resistance and chemical stability.


And it has good heat resistance(1500c) and plasma resistance. The usage are precision machinery parts( vacuum chucks,line guides of electrical resistance) surface plates(XY tables, air slides) etc.


Zirconia ceramic is one of the most useful ceramic materials. It has superior mechanical strength and wear resistance ,its tenacity is 3-4 times that of alumina and it offers superior heat insulation.


The usage is blaco for heat insulation, guide spacer, nozzles, metal fittings, pump parts


 


Specifications:


 


 




































































































































Name



Unit 



Alumina



Zirconia 



Content 



%



≥95



≥99



≥99.7



≥94



Density



g/cm3



3.60



3.90



3.90



6.00



Hardness (Hv0.5)



GPa 



13.1



15.0



17.1



13.2



flexural strength


 



MPa≥



340



310



370



1000



Elasticity



  GPa



 300



 330



 350



 200



Poisson's ratio


 



 



 0.23



 0.23



 0.23



 0.30



Max Tem. 



°C≥



1400



1750



1800



1050



Heat expansion



×10-6/°C(40-800°C)



7.8



8.0



8.0



11.0



Thermo conductivity


 



W/m·K( 20°C)



22



28



31



2.6



Thermal Resistance



 °C



 200



 200



 230



 300



dielectric strength


 



 V/m



 15×106



 15×106



 15×106



 11×106



dielectric phase angle


 (1MHz)



 ×10-4



4



2



1



16 



SIC(1MHz)



 



9.2



9.8



9.9



33



Nitric Acid


 (60%)90°C



WT Loss mg/cm2/day≤



0.12



0.10



0.05



  ≠0



Sodium hudroxide


 (30%)80°C



WT Loss mg/cm2/day≤



0.53



0.26



0.04



0.08



 


 


 


 


 


 


 


 


321


 


 


 


 


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