Testing of Si-COAT 570 high voltage insulator coating under high vacuum conditions

Si-COAT 570是由位于安大略圭尔夫的CSL Silicones生产的单组分室温硫化（RTV）聚硅氧烷（硅酮）涂料。Si-COAT 570是一种独特的专利配方，可提供高度疏水的表面，提高对水、少量电解质和颗粒引起的闪络的抵抗力。此外，已知该涂层不受电晕放电、化学污染物、极端温度或腐蚀性环境的影响。Si-COAT 570采用精确量的非反应性低分子量有机硅和具有精确粒度的成分，以实现最佳性能和可靠性。Si-COAT 570已在极端环境条件下使用和测试，但从未在高真空下使用和测试。在这里，我们建议研究Si-COAT 570在1 E-7至1 E-3 μ m真空度范围内的性能。该涂料将应用于高压陶瓷绝缘子的表面，并在10至300 kV的电压范围内进行测试。将在不同真空条件下进行表面击穿研究，然后进行表面表征分析。这些实验将使CSL Silicones能够将其现有的Si-COAT 570应用产品组合扩展到新的领域，包括电子源、电子衍射仪器、电子显微镜、粒子加速器等的开发。

Si-COAT 570 is a one-part, room temperature vulcanizing (RTV) polysiloxane (silicone) coating produced by CSLSilicones in Guelph, Ontario. Si-COAT 570 is a unique and patented formulation that provides a highly hydrophobic surface, which increases the resistance to flashovers induced by water, small amounts of electrolyte, and particulates.In addition, the coating is known not to be affected by corona discharge, chemical contaminants, extreme temperatures or corrosive environments. Si-COAT 570 is engineered with exact amounts of non-reactive, low molecular weight silicone and ingredients with precise particle sizes for optimum performance and reliability.Si-COAT 570 has been used and tested under extreme environmental conditions but never under high vacuum. Here we propose to study the performance of Si-COAT 570 at vacuum levels ranging from 1E-7 to 1E-3 torr. The coating will be applied to the surface of high-voltage ceramic insulators and tested at voltages ranging from 10 to 300 kV. Surface breakdown studies under different vacuum conditions followed by surface characterization analyses will be performed. These experiments will permit CSLSilicones to expand their current application portfolio of Si-COAT 570 to new fields that involve the development of electron sources, electron diffraction instruments, electron microscopes, particle accelerators, and others.