Fiber medium-temperature longitudinal coefficient-of-linear-expansion testing device

Abstract

The invention discloses a fiber medium-temperature longitudinal coefficient-of-linear-expansion testing device, the temperature range of which is from a room temperature to 800 DEG C. The fiber medium-temperature longitudinal coefficient-of-linear-expansion testing device comprises a grate, a gas tube, an electric heating furnace, a thermocouple, a quartz differential sensor unit, a quartz differential sensor unit bracket, a raster digital displacement sensor probe, a raster digital universal meter, a temperature-controlled instrument, and an inert gas cylinder. The fiber medium-temperature longitudinal coefficient-of-linear-expansion testing device has a technical core of the design of the quartz differential sensor unit and a connecting method of a fiber sample to be tested. The fiber medium-temperature longitudinal coefficient-of-linear-expansion testing device is capable of effectively solving all main technical problems and difficulties of the prior art, and remarkably improving the longitudinal coefficient-of-linear-expansion testing precision of fiber materials with low coefficient-of-linear-expansion characteristic.

Description

technical field [0001] The invention relates to a test device for the medium-temperature longitudinal linear expansion coefficient of fibers, and the device is also applicable to other flexible silk materials, strip materials and the like. The invention belongs to the technical field of detection and analysis of thermal physical properties of fibers at high temperature (room temperature to 800° C.), and aims to realize accurate testing and evaluation of high-temperature longitudinal linear expansion coefficients in fiber materials with low linear expansion coefficient characteristics. Background technique [0002] The present invention is firstly based on the urgent need for accurate testing and evaluation of the high-temperature longitudinal linear expansion coefficient of carbon fibers, because carbon fibers have both excellent high-temperature mechanical properties, thermophysical properties, and acid and alkali resistance, and at the same time possess softness and machina...

AI Technical Summary

Problems solved by technology

When this type of analytical instrument is used to test the longitudinal linear expansion coefficient of low-expansion fiber materials, there are also the following technical problems: first, the differential transformer is used to test the displacement of the sample, and the differential transformer is easily affected by the electromagnetic field of the laboratory environment. Poor stability, zero drift can reach several microns or even larger within 4 hours of analysis

However, it is not applicable to the test of longitudinal linear expansion coefficient of low-expansion fiber materials

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