Ceramic fiber resistivity testing method
A ceramic fiber and testing method technology, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc., can solve problems such as errors in circuit connection methods, avoid damage, avoid interference from electromagnetic fields and electrostatic effects, and improve The effect of sample preparation success rate
Active Publication Date: 2015-05-06
XIAMEN UNIV
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Problems solved by technology
More importantly, the circuit connection method required by the four-probe method will produce non-negligible errors during the high-resistance test.
There are no patents and literature reports on the method of measuring the resistivity of ceramic fibers
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Embodiment 1
[0029] see Figure 1~3 , to measure the resistivity of continuous SiC fibers
[0030] Raw material: continuous silicon carbide fiber 6; length after cutting is 30mm, 10 pieces;
[0031] Metal plate sample table 2: the bottom is a 120mm×100mm plastic insulating plate 4, and two parallel copper plates are fixed on the upper end, the distance between the plates is 25mm, and the size of the copper plate is 70mm×20mm×5mm;
[0032] Double-sided tape 3: the width is 8mm;
[0033] Conductive silver paste 5: SPI;
[0034] Copper wire 10: several pieces;
[0035] wire terminal 1;
[0036] Blade 11: common blade.
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Abstract
The invention relates to ceramic fibers, in particular to a ceramic fiber resistivity testing method. Multiple ceramic fibers are parallelly bonded to a metal plate sample table through double-sided adhesive tapes; the fibers are parallelly connected through silver conductive adhesive; after the silver conductive adhesive solidifies, a fiber sample and the metal plate sample table are put in a metal electromagnetic shielding box; the metal plate sample table, an electrometer for testing circuit current and a digital source meter providing test voltage are connected in series; under the constant-temperature constant-humidity condition, a micro current test is performed; after one current value is measured, voltage output of the digital source meter is closed; the metal electromagnetic shielding box is opened, one fiber is torn off, and corresponding micro current of the remaining parallel fibers is continually measured until that the current of the different fibers is all tested; resistivity values of the multiple groups of fibers different in quantity are solved according to the ohm law and a volume resistivity formula, and a statistical average is acquired. The problem that high resistance of the fine-diameter ceramic fibers cannot be accurately measured can be effectively solved.
Description
technical field [0001] The invention relates to ceramic fibers, in particular to a method for testing the resistivity of ceramic fibers. Background technique [0002] Ceramic fibers mainly include non-oxide ceramic fibers and oxide ceramic fibers. Non-oxide ceramic fibers mainly include silicon carbide fibers, silicon nitride fibers, boron nitride fibers, etc. Oxide ceramic fibers mainly include alumina fibers, Zirconia fiber and yttrium aluminum garnet fiber, etc. In addition to the common characteristics of high temperature resistance, low density, and high strength, the above-mentioned fibers also have different functions, and have their own important applications in aerospace and advanced weaponry. One of the important applications is to use the above-mentioned fibers as dielectric materials to prepare high-performance composite materials for use in electromagnetic functional devices. The electrical resistivity of ceramic fibers is usually used to evaluate their dielec...
Claims
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IPC IPC(8): G01R27/14
Inventor 李思维李永财李华展陈立富苏智明涂惠彬
Owner XIAMEN UNIV
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