Method for testing hydrolysis resistance of carbon fiber composite core

Abstract

The invention provides a method for testing hydrolysis resistance of a carbon fiber composite core. The method comprises the following steps: obtaining a plurality of carbon fiber composite core samples with the same lengths, and sequentially performing surface treatment, drying treatment, moisture absorption treatment, aging treatment, secondary drying treatment and secondary moisture absorptiontreatment on each carbon fiber composite core sample; weighing the weight of each carbon fiber composite core sample in each stage, obtaining the mass fraction of each carbon fiber composite core sample according to a moisture absorption mass fraction calculation formula, further obtaining the moisture absorption rate of the carbon fiber composite core sample, and effectively checking the hydrolysis resistance of the carbon fiber composite core according to the moisture absorption rate; the degradation performance of the carbon fiber composite core caused by hydrolysis reaction is characterized by utilizing the moisture absorption performance of the boiled carbon fiber composite core, so that the hydrolysis resistance of the carbon fiber composite core is known; the method is simple and easy to operate, and can be applied to various occasions such as product design, raw product control and sampling tests.

Description

technical field [0001] The invention relates to the technical field of performance testing of carbon fiber composite materials, in particular to a method for testing the hydrolysis resistance of carbon fiber composite cores. Background technique [0002] Carbon fiber composite core is a round rod made of carbon fiber and resin-based materials. Due to its light weight, high strength, and good corrosion resistance, it has been used in overhead line conductor cores and bridge cables. In the actual operation process, the carbon fiber composite core has been exposed to the atmospheric environment for a long time, and has withstood the test of various climatic conditions and strong mechanical loads. As a resin-based fiber-reinforced composite material, the interface performance between resin and carbon fiber It has a significant impact on the long-term performance of the carbon fiber composite core. At present, the inspection methods for carbon fiber composite cores are generally...

AI Technical Summary

Problems solved by technology

At present, the inspection methods for carbon fiber composite cores are generally carried out according to "Fiber Reinforced Resin Matrix Composite Mandrels for Overhead Conductors" (GB / T 29324), mainly including appearance, diameter deviation and f value, tensile strength, linear expansion coefficient, Density, winding, torsion, radial pressure resistance, glass transition temperature, high temperature tensile strength, elastic modulus, fluorescent ultraviolet aging resistance, salt spray test, etc., but there is no microscopic performance such as hydrolysis resistance of carbon fiber composite core. Corresponding inspection method, it is difficult to comprehensively evaluate the performance of carbon fiber composite core

[0003] At present, the water boiling test has been widely used as an effective performance test method in the performance test of the composite insulator mandrel of the transmission line. It reflects the hydrolysis resistance of the core, but the carbon fiber composite core is a material between the conductor and the insulator. Applying a voltage to it will generate a large current, and the hydrolysis effect of the material caused by water boiling will cause the leakage of the measurement The amount of current change is much smaller than the conductance current of the carbon fiber composite core itself, and it is difficult to characterize the hydrolysis by measuring the leakage current under pressure, so the test method of the composite insulator core cannot be applied

On the other hand, the water immersion or moisture absorption test is widely used in various materials, but the unpretreated sample can only reflect the current moisture absorption performance, and cannot reflect the hydrolysis resistance of the material

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