Lightning arrestor connector lead magnesium niobate qualification pellet test procedures.

Tuohig, W. (Honeywell FM&T, Kansas City, MO) ; Mahoney, Patrick A. ; Tuttle, Bruce Andrew ; Wheeler, Jill Susanne

关键词: COMMUNICATIONS;    CONNECTORS;    CURIE POINT;    DEPOSITION;    DIELECTRIC MATERIALS;    DISSIPATION FACTOR;    DOCUMENTATION;    ELECTRICAL TESTING;    ELECTRODES;    GEOMETRY;    KNOWLEDGE PRESERVATION;    LIGHTNING;    MAGNESIUM;    NIOBATES;    PELLETS;    PERMITTIVITY;    PERSONNEL;    SAMPLE PREPARATION;    TITANATES Dielectric devices.;    Curie temperature.;    Lightning-arresters.;   

DOI  :  10.2172/952156
RP-ID  :  SAND2009-0331
PID  :  OSTI ID: 952156
Others  :  TRN: US200913%%432

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Enhanced knowledge preservation for DOE DP technical component activities has recently received much attention. As part of this recent knowledge preservation effort, improved documentation of the sample preparation and electrical testing procedures for lead magnesium niobate--lead titanate (PMN/PT) qualification pellets was completed. The qualification pellets are fabricated from the same parent powders used to produce PMN/PT lightning arrestor connector (LAC) granules at HWF&T. In our report, the procedures for fired pellet surface preparation, electrode deposition, electrical testing and data recording are described. The dielectric measurements described in our report are an information only test. Technical reasons for selecting the electrode material, electrode size and geometry are presented. The electrical testing is based on measuring the dielectric constant and dissipation factor of the pellet during cooling from 280 C to 220 C. The most important data are the temperature for which the peak dielectric constant occurs (Curie Point temperature) and the peak dielectric constant magnitude. We determined that the peak dielectric constant for our procedure would be that measured at 1 kHz at the Curie Point. Both the peak dielectric constant and the Curie point parameters provide semi-quantitative information concerning the chemical and microstructural homogeneity of the parent material used for the production of PMN/PT granules for LACs. Finally, we have proposed flag limits for the dielectric data for the pellets. Specifically, if the temperature of the peak dielectric constant falls outside the range of 250 C {+-} 30 C we propose that a flag limit be imposed that will initiate communication between production agency and design agency personnel. If the peak dielectric constant measured falls outside the range 25,000 {+-} 10,000 we also propose that a flag limit be imposed.