Composite piezoelectric material for detecting external pressure of cable and manufacturing method of composite piezoelectric material

Abstract

The invention relates to a composite piezoelectric material for detecting external pressure of a cable and a manufacturing method of the composite piezoelectric material. The composite piezoelectric material is prepared from the following raw materials based on parts by weight: 30-35 parts of solute-containing polyvinylidene fluoride solution, 3-5 parts of modified PbTiO3, 2-3 parts of [Pb(Zr<0.3>Ti<0.7>)O<3>], 3-5 parts of graphene, 0.5-1 part of sulfonamide adhesion promoter, 8-10 parts of {Pb<0.95>Cr<0.02>Ca<0.03>[(Ni<1 / 3>Nb<2 / 3>)<0.5>.Zr<0.2>.Ti<0.3>]O<3>} and 10-15 parts of aluminum-chromium intermediate alloy ingot. The composite piezoelectric material for detecting the external pressure of the cable has the advantages of acid, alkali, salt fog and atmospheric corrosion prevention, high-temperature resistance, good mechanical property and high impact-resistant capability.

Description

technical field [0001] The invention relates to the field of electrical materials, in particular to a composite piezoelectric material for cable external pressure detection and a manufacturing method thereof. Background technique [0002] Cables are used to transmit electric (magnetic) energy, information and wire products that realize electromagnetic energy conversion. They play an extremely important role in modern industry and people's daily life. Therefore, the frequent failure of cables will also bring great negative effects. impact, and as modern cables are more widely used, failure cases abound. [0003] Although it seems that there are many reasons for cable failure, in fact, more than 95% of cables fail due to the following three reasons: 1. Mechanical damage: the outer sheath of the cable is often torn or crushed, and there is no cracked sheath. There are burrs or abrasion marks on the surface of the sheath; there are no signs of damage on the outside of the sheat...

AI Technical Summary

Problems solved by technology

2. The bending radius exceeds the recommended value: When the cable is bent and its bending radius is much smaller than the bending radius recommended by the manufacturer, the internal components of the cable are prone to mechanical damage

[0004] 3. Kinks: Kinks are initially caused by knot loops, most often when the cable is "pulled" from a fixed reel, and cannot be easily undone

Kinking can cause permanent "weakness"

[0005] In fact, we can find that these three failure principles can be prevented by setting a long-distance linear pressure detection device on the surface of the cable or finding the failure point after failure. The limitation of temperature and almost all sensitive piezoelectric materials are crystals, which are brittle and have a small expansion coefficient, which makes it completely incompatible with the environment in which cables are used.

The surface of the cable is always exposed to the outside world, and is subject to many and irregular mechanical forces such as wind. Therefore, conventional piezoelectric materials that cannot cope with acid, alkali, salt spray, atmospheric corrosion, low strength, and impact resistance in the prior art cannot be realized at all. Real-time monitoring of cable surface force