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> Alumina
Alumina
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Alumina coatings deposited using Thermal Spray Coating Technology have many production uses. Applied via Plasma Flame Spray, these coatings exhibit high hardnesses and excellent resistance to hard surface wear. Less dense coatings can be achieved using LVCG (low velocity combustion gas) spray systems making the coating more resistant to thermal shock and permitting greater infusion of liquid sealers.
Alumina coatings provide excellent dielectric strength making them ideal for electrical isolation at temperatures most polymers will not survive.
Alumina thermal spray powders are available in several common sizes and purities.
Typical applications include providing resistance to wear by fibers, threads, packing or lip seals, and hard surfaces such as sheet steel. Dielectric applications include soldering iron tips, electrical coils and electrical isolation of rolls and metal housings. Alumina can replace plastic insulators where high temperatures prevent their use.
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Material
Application Method
Particle Size (microns)
Porosity (Vol.%)
Macro-hardness (Rc)
Cross Sectional Hardness (DPH300)
As Sprayed Surface Finish (AA)
Ground Finish (AA)
Tensile Bond Strength (PSI)
Thickness Limit (inches)
Dielectric Strength (V/Mil)
Alumina 98
LVCG
-45 +15
4
40
690
500
63-125
2000-3000
>0.020
300
Alumina 98
Plasma
-45 +5
1
60
690-750
300
32
3500
>0.020
300
Alumina 99
Plasma
-45 +5
1
60
690-750
300
32
3500
>0.020
300
Alumina 99
LVCG
-45 +5
4
40
690
500
63-125
2000-3000
>0.020
300
Alumina 99.3
LVCG
-22 +5
2
55-60
750
150
16-32
3500
0.02
300
Alumina 99.3
Plasma
-22 +5
>1
65
850-1000
150
16
4500
0.015
300
Alumina 99.5
Plasma
-31 +3.9
>1
65
850-1000
150
16
4500
0.015
300
Alumina 99.5
LVCG
-31 +3.9
2
55-60
75
150
16-32
3500
0.02
300