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Ceramic
Balls |
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Ceramic Balls
Balls manufactured from ceramic materials are extremely resistant
to corrosion and abrasion, and offer excellent performance
characteristics. TRD Specialties offers a variety of precision
ceramic balls, each providing its own unique corrosion and
heat resistant qualities. Alumina Oxide Balls
Alumina oxide ceramic balls have proven performance in wear,
heat and corrosive environments as well as in maintaining dimensional
stability at temperatures up to 2000 F. Alumina resists oxidation
and is tolerant to water, salt solutions, and many chemicals
and acids.
|
Alumina
Oxide Balls Properties |
| Compressive Strength |
330,000 psi |
| Maximum Useful Temperature |
3180°F |
| Thermal Conductivity |
35.6 W/m °C (@ 20°C), 6.3W/m °C (@ 800°C) |
| Thermal Expansion |
4.6 x 10
to the -6th power /°F |
| Electrical Resistivity |
>10 to the 14th power
Ohm/cm (@25°C), 2.5 x 10
to the 6th power Ohm/cm (@900°C) |
| Young's Modulus of Elasticity |
54 x 10 to the 6th power
psi |
| Hardness |
1365 Vickers |
| Density |
.139 lbs/inch to the
3rd power |
Ruby Sapphire Balls
Ruby Sapphire balls are opaque red in color and frequently
used in gauging devices. They are also suited for use in optical
and light refractive applications, such as lasers. Ruby Sapphire
is resistant to most corrosive material even at very high temperatures.
Ruby Sapphire’s maximum useful temperature is 3250° F.
|
Ruby Sapphire
Ball Properties |
| Compressive Strength |
300,000 psi |
| Maximum Useful Temperature |
3180°F |
| Thermal Conductivity |
.086 Cal/sec cm °C |
| Thermal Expansion |
3.2 x 10 to
the -6th power / °F |
| Electrical Resistivity |
10 to the 9th power Ohm/cm
(@500°C), 10 Ohm/cm (@2000°C) |
| Young's Modulus of Elasticity |
50 x 10 to the 6th power
psi - 55 x 10 to
the 6th power psi |
| Hardness |
1570-1800 Vickers |
| Density |
.144 lbs/inch to the
3rd power |
Silicon Nitride Balls
Silicon Nitride balls are a popular choice for bearing designers
and other high precision product applications Long life makes
this material very suitable for aviation applications. Silicon
Nitride is anti-magnetic and resistant to corrosion by most
substances.
|
Silicon
Nitride Ball Properties |
| Compressive Strength |
341,300 psi |
| Maximum Useful Temperature |
2552 °F |
| Thermal Conductivity |
.07 Cal/sec cm °C |
| Thermal Expansion |
1.78 x 10
to the -6th power /°F |
| Electrical Resistivity |
>10 to the 6th power
Ohm/cm (@500°C), 10
to the 5th power Ohm/cm (@ 2000°C) |
| Young's Modulus of Elasticity |
47 x 10 to the 6th power
psi |
| Hardness |
1500 - 2000 Vickers |
| Density |
.116 lbs/inch to the
3rd power |
Zirconia Balls
In certain applications Zirconia balls operate two
to three times longer than metal or carbide. Zirconia balls
are inert
to corrosive materials with the exception of hydrofluoric acid
and hot, concentrated sulfuric acid. Zirconia has a maximum
useful temperature of 1800° F.
|
Zirconia
Ball Properties |
| Compressive Strength |
794,837 psi |
| Maximum Useful Temperature |
1800 °F |
| Thermal Conductivity |
0.007 Cal/cm, Sec 0 |
| Thermal Expansion |
10.9 x 10 to
the -6th power / °C |
| Electrical Resistivity |
2.2 x 10 to the12th power
cm |
| Young's Modulus of Elasticity |
30.6 x 10 to the 6th
power, 21700 kgr/mm to the
2nd power |
| Hardness |
1250 kgr/mm to the 2nd
power |
| Density |
.219 lbs/inch to the
3rd power |
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