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Flexible piezomagnetic composite material and preparation method thereof

A composite material and flexible technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of small interaction force between magnetic powder and rubber, unable to meet the performance requirements, and poor elasticity and mechanical properties of liquid silicone rubber.

Inactive Publication Date: 2008-01-09
GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor elasticity and mechanical properties of liquid silicone rubber, and the large number of air bubbles introduced during the compounding process of magnetic powder and liquid rubber are difficult to get rid of, and because the superfine powder has not been effectively modified by surface modification and strong mechanical dispersion, the agglomeration is very serious. Ultrafine magnetic powder cannot be effectively and evenly dispersed in liquid rubber, and the interaction force between magnetic powder and rubber is small. These factors cannot ensure that the piezoelectric composite film has good composition / structural uniformity and piezoelectric performance stability. Therefore, It has wide application prospects as a magnetic rubber functional material such as on / off electrical buttons, magnetic heating elements and magnetic seals.
The patent uses a single raw material composition and a simple composite technology to prepare the piezomagnetic material, which cannot meet the performance requirements of the measurement material for quantitative testing of mechanical parameters-the force sensor sensitive element material

Method used

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  • Flexible piezomagnetic composite material and preparation method thereof
  • Flexible piezomagnetic composite material and preparation method thereof
  • Flexible piezomagnetic composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Preparation and surface modification of ultrafine soft magnetic powder materials.

[0051] Cut a variety of thin strips of soft magnetic materials with good piezoelectric properties into short strips of hundreds of millimeters, place them in a high-temperature furnace under the protection of an inert gas atmosphere such as argon, nitrogen, and heat-treat at 150°C to 600°C for 0.1h ~5h, crushed to obtain millimeter-sized sheets, and then placed in a coordination type containing low-boiling alkanes such as n-hexane, aromatic hydrocarbons such as toluene, and any organic solvent such as acetone and ethanol, which are 0.2% to 1% of the mass of magnetic powder In the ceramic grinding tank of phosphite coupling agent KR-41B (produced by Kenrich Petrochemical Company in the United States), grind with equipment such as planetary mill or stirring mill for 0.5h~48h to make soft magnetic powder slurry with a particle size of 50nm~200μm The slurry is classified by sedimentation and...

Embodiment 2

[0053] Preparation of Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 Amorphous powder / silicone rubber piezomagnetic composite.

[0054] Weigh the ternary regular copolymerized silicone rubber according to the formula in Table 1, and dissolve it in 10 times the mass of n-hexane solvent at room temperature or under the condition of adding ultrasonic waves, and dissolve it for 2d to 7d to obtain silicone rubber-n-hexane Alkane Sol B 1 . Weigh the amount of Fe in the recipe 73.5 Cu 1 Nb 3 Si 13.5 B 9 Amorphous powder added to Sol B 1 In the process, after ultrasonic dispersion for 1h and magnetic stirring for 2h, the amorphous powder was uniformly dispersed in the silicone rubber-n-hexane sol B 1 , to get sol B 2 middle. Sol B was made using a rotary evaporator 2 Fast gel to get Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 Amorphous powder / silicone rubber gel B 3 , gel B 3 After being placed in the fume hood for 24h ~ 7d, use an open rubber mixing machine to press into thin slices with a th...

Embodiment 3

[0060] Preparation of Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 Nanocrystalline powder / NR-NdBR composite piezomagnetic material.

[0061] Put natural rubber (NR) and rare earth neodymium butadiene rubber (NdBR) in an internal mixer for 3 minutes according to the formula in Table 2, and first add 1 / 2 of Fe with a particle size of 5 μm 73.5 Cu 1 Nb 3 Si 13.5 B 9 Nanocrystalline powder, after banburying for 3 minutes, add 1 / 4 nanocrystalline powder, add all additives except vulcanization accelerator and sulfur, and banbury for 3 minutes, then add the remaining 1 / 4 nanocrystalline powder and banbury for 5 minutes to produce glue. Thin pass 6 times on the double-roller rubber mixing machine and then unload. After the mixed rubber of the next piece is sealed and stored in a plastic bag for 2 days to 7 days, it is re-milled on the open mill for 5 minutes every two days, and it is thinned and passed 3 times. Add a vulcanization accelerator during the fifth re-milling, knead for 5 minute...

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Abstract

A flexible piezo-magnetic composite material and its production are disclosed. It consists of non-crystalline and / or nanometer crystal soft magnetic powder material with grain size 0.1-200 mum, flexible polymer and auxiliary additive ingredients. It can be used to inspect contact stress during casing and pipeline assembly curved profiled structure connection and impact process of large equipments and sophisticated engineering; it can be used to real-time monitor usage performance, relating components and functional material ageing and stress of system when they are mounted, stored and transported. It can be used in biological technology, medicine, sports, vehicles and aerospace industries.

Description

technical field [0001] The invention relates to a flexible piezoelectric composite material and a preparation method. The flexible piezoelectric composite material uses amorphous and / or nanocrystalline soft magnetic powder materials and flexible polymer materials as basic components, and can be used for the preparation of sensitive elements of force sensors. Background technique [0002] In the field of large-scale equipment systems and cutting-edge technology, it is often necessary to conduct systematic research on the connections between shell components, pipeline components and other curved-surface special-shaped structural components, and many contact mechanics suffered during the impact process, so that the contact stress detection between curved-surface special-shaped structural components becomes a A hot topic in the field of force sensors. Silicon stress sensors, copper-manganese alloy stress sensors, and graphite stress sensors based on the piezoresistive effect of...

Claims

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Application Information

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IPC IPC(8): C08L83/00C08K3/08H01F1/20H01F1/153C08L21/00C08L75/00C08L27/00C08L9/00C08L23/00C08K5/18C08K5/09C08K5/47C08K5/31C08K3/22
Inventor 黄渝鸿吴菊英郭静高洋朱正吼梅军谭云马广斌付强衣志勇黄琨张凯范敬辉
Owner GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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