Soild ceramic hex head bolt, flat washer and hex nutFastener Failure in High & Low Voltage Environments… SOLVED!

Solid ceramic fasteners are ideal in both low and high voltage envronmentsMaterials used for electrical insulation can be required to either contain the voltage, or not interfere with the voltage. High mechanical strength is also a requirement in many such applications. While fasteners may not serve in the role of insulator, their proximity to the electrical field often demands they possess the same critical properties as the insulator itself.

The ability to deliver all three characteristics is found in one material: ceramics. Now, when facing this problem, you'll have the solution… Solid Ceramic Fasteners & Ceramco!

High Voltage Applications

High voltage applications produce currents so strong they find any defect, leading to the corona effect, corona discharge, or worse, a conduction path other than the one intended for the current. Ceramco’s  solid ceramic fasteners of A998 alumina are engineered to provide a defect-free connection for high voltage insulation applications. Our solid ceramic fasteners are tested under a vacuum for leaks and inspected for cracks with a dye penetrant. Fastener batches are also visually inspected under magnification.

Low Voltage Applications

Managing low voltage electrical fields in sensitive analytical instruments (for example) require equally as sensitive fasteners. In such applications signals as low as 70 eV are found and cannot be interfered with. The high purity of Ceramco’s A998 alumina makes it the ideal material for fasteners for similar applications. Solid ceramic fasteners made of Ceramco’s high purity A998 alumina are non-conductive, gas-tight (non-outgassing) and inert, assuring non-interference. Ceramco already serves numerous areas of the electronics and instrumentation market.

Voltage resistance, conductance or mechanical strength are not always the only considerations when choosing a superior fastener. Selecting the correct ceramic material for a fastener may require guidance from Ceramco's materials engineers. Please contact us for assistance.

Strength

You now know Ceramco solid ceramic fasteners can provide both electrical resistance (like some polymers) and electrical conductance (like most alloys). What you may not realize is that manufacturing techniques exist to produce a solid ceramic fastener with high mechanical strength.

Strength is accomplished in two ways:

  1. Fully molding the solid ceramic fastener, including the threads to avoid machining, as it is the machining that weakens the ceramic.
  2. Full density firing of the solid ceramic fastener; the ceramic composition determines the length of time it can fired.

Ceramco’s alumina and zirconia fastener compositions are fully molded and fired to full density, resulting in a heat resistant and strong solid ceramic fastener. Solid ceramic fasteners (like all fasteners) have limits to their strength ratings. These characteristics are called: Mechanical Properties." When not over-torqued, or subjected to impacts, Ceramco’s solid ceramic fasteners deliver consistent, reliable and long lasting performance in both high and low voltage environments.

Please contact Ceramco for assistance with questions on solid ceramic fastener material strength.

Comparison of Material Properties a

Material Maximum
Service
Temperature
Thermal
Conductivity
Electrical
Conductivity
Volume
Resistivity
Coefficient
of Thermal
Expansion
Alumina (99.8%) Very High Very Low Very Low Excellent Low
Zirconia TZP b Moderate Very Low Very Low Excellent Very Low
Molybdenum Very High Very High Low Poor Very Low
Nylon 6,6 Very Low Very Low Very Low Excellent Low
Stainless Steel Moderate High Moderate Very Poor Very High
Titanium High Moderate High Very Poor Moderate
a. Averages intended for quick comparison only. No guarantee should be assumed or is implied.
b. Yttria Stabilized

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Want to learn more about the properties of Ceramco's ceramic products, materials and processes?

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Heat Resistant Corrosion Resistant Non-conductive Non Out-Gassing

Stock ceramic fasteners from Ceramco, Inc. Specializing in custom ceramic parts of complex geometries. Learn More.

Immediate Assistance is only a phone call away. If you have any questions or require additional information, please call Ceramco at: +1 (603) 447-2090, Monday - Friday, 8:00 am - 4:30 pm, U.S. Eastern.