Alumina Bolt

Size : M4x35mm, HeadStyle : Hexagonal, Pitch : 0.7mm, Standard : ANSIB18.6.7M-1985

SKU: AL60BO47 카테고리: 태그: ,

Alumina Al2O3

Minerals containing Alumina represent some 15% of the earth’s crust. It is therefore an abundant material and virtually inexhaustable, unlike raw materials for many alloys developed for special applications.

The combination of high thermal conductivity, low thermal expansion and high compressive strength leads to good thermal shock resistance, so Alumina is suited to furnace use as crucibles, tubes and thermocouple sheaths. High purity Alumina can be used up to 1700C and is gas tight up to 1300C. Few chemicals attack Alumina.

Alumina also shows good electrical insulation at high temperatures, good wear resistance and high hardness, making it suitable for components such as ball valves, piston pumps and deep drawing tools.

Diamond tools are needed to machine or grind Alumina. Remarkably, continuous filament yarns have been made from alumina with reasonable but not complete success and two, similar. They are both much less flexible than normal continuous filament yarns and are rather “hairy” i.e. have broken filaments – especially the FP version.

Size :M4 x 35mm

Head Style :Hexagonal

Pitch :0.7mm

Standard :ANSI B18.6.7M-1985

Chemical Resistance    
Acids – concentrated Good  
Acids – dilute Good  
Alkalis Good  
Halogens Good  
Metals Good  
     
Electrical Properties    
Dielectric constant   9.0-10.1
Dielectric strength ( kV mm-1 )   10-35
Volume resistivity @25C ( Ohmcm )   >1014
     
Mechanical Properties    
Compressive strength ( MPa )   2200-2600
Hardness – Knoop ( kgf mm-2 )   2100
Hardness – Vickers ( kgf mm-2 )   1500-1650
Shear strength ( MPa )   330
Tensile modulus ( GPa )   300-400
     
Physical Properties    
Apparent porosity ( % )   0
Density ( g cm-3 )   3.9
Water absorption – saturation ( % )   0
     
Thermal Properties    
Coefficient of thermal expansion @20-1000C ( x10-6 K-1 )   8
Melting point ( C )   2100
Specific heat @25C ( J K-1 kg-1 )   850-900
Thermal conductivity @20C ( W m-1 K-1 )   26-35
Upper continuous use temperature ( C )   1700
     
Properties for Alumina Fiber    
Property   Value
Coefficient of thermal expansion – Longitudinal x10-6 K-1 5.7
Density g cm-3 3.9
Modulus GPa 380
Tenacity GPa 1.4