Electromagnetic shielding iron-based composite material and preparation method thereof

An iron-based composite material and electromagnetic shielding technology, which is applied in the fields of magnetic/electric field shielding, electrical components, metal processing equipment, etc., can solve the problems of low strength, poor formability, and low strength of pure iron, so as to meet heat dissipation requirements and improve strength , Improve the effect of tensile strength

Pending Publication Date: 2022-07-08
SUZHOU CHUANGHAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above materials have low strength and poor formability, and do not meet the multi-functional and wide, thin, strong, light and other development directions required by the current electronics industry. Therefore, it is necessary to provide a high-strength, high-toughness, wide-frequency electromagnetic shielding for electronic products Composite materials have become a technical problem to be solved urgently in this field
Pure iron is the material with the best shielding performance at present, but the strength of pure iron is low, and the general tensile strength is about 200MPa. Electronic products not only need to realize electromagnetic shielding in a limited space, but also need materials with high strength to meet structural performance requirements.

Method used

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  • Electromagnetic shielding iron-based composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Micron-level pure iron powder and siloxane electromagnetic shielding composite material and preparation process, the micron-level pure iron powder, diameter of 30μm, mass of 500g, liquid siloxane 2.5g, first dissolve liquid siloxane in 20g of anhydrous Then add the liquid siloxane dissolved in absolute ethanol into the micron-sized pure iron powder for ball milling. The micron-level pure iron powder coated with siloxane is pressed into a number of circular sheets with a diameter of 20 mm and a thickness of 2 mm by a cold press, and the pressure is 100 MPa. -3 Pa, the sintering temperature is 1000°C, and after sintering, it is rolled to an electromagnetic shielding iron-based composite material sheet with a thickness of 0.3 mm.

Embodiment 2

[0030] Micron-scale, nano-scale pure iron powder and siloxane electromagnetic shielding composite material and preparation process, micron-scale pure iron powder, diameter of 10μm, mass of 300g, nano-scale pure iron powder, diameter of 500nm, mass of 300g, liquid state 10g of siloxane, first dissolve the liquid siloxane in 50g of anhydrous ethanol, then add the liquid siloxane dissolved in the anhydrous ethanol into the micron-sized and nano-sized pure iron powder for ball milling, the ball milling time is 60min, the ball milling After drying, the drying temperature is 120°C, and the drying time is 60 minutes. After drying, the micron-level and nano-level pure iron powder coated with siloxane on the surface is pressed by a cold press into a number of lengths, widths of 50mm, and heights of 25mm. The cuboid, the pressure is 150MPa, the cuboid is sintered at high temperature in a vacuum, and the vacuum degree is 10 -3 Pa, the sintering temperature is 1100°C, and after sintering,...

Embodiment 3

[0032] Nano-scale pure iron powder and siloxane electromagnetic shielding composite material and preparation process, nano-scale pure iron powder, diameter of 200nm, mass of 500g, liquid siloxane 20g, liquid siloxane is first dissolved in 120g of absolute ethanol Then add the liquid siloxane dissolved in absolute ethanol into the nano-scale pure iron powder for ball milling. The nano-scale pure iron powder coated with siloxane was pressed into several hollow cylinders with an inner diameter of 30mm, an outer diameter of 60mm, and a length of 100mm by cold isostatic pressing, and the pressure was 180MPa. High temperature sintering, vacuum degree is 10 -3 Pa, the sintering temperature is 1200°C, and after sintering, it is rolled to an electromagnetic shielding iron-based composite material pipe with a thickness of 1mm and an inner diameter of 10mm.

[0033] Effect evaluation 1

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Abstract

The invention belongs to the field of electronic composite materials, and particularly relates to an electromagnetic shielding iron-based composite material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing and drying micron-scale or nano-scale pure iron powder particles and liquid siloxane, preparing a green body by adopting a cold pressing process, sintering and molding at high temperature in vacuum, and finally preparing the electromagnetic shielding material with the required size by adopting an extrusion or rolling process. By means of the process, silicon dioxide formed during high-temperature cracking of siloxane is evenly distributed in the iron-based material in a net shape, the electromagnetic shielding effect of the rolled iron-based composite material is guaranteed, the tensile strength of the iron-based material is remarkably improved, and meanwhile the heat dissipation requirement of an electronic material is met.

Description

technical field [0001] The invention belongs to the field of electronic composite materials, in particular to an electromagnetic shielding iron-based composite material and a preparation method thereof. Background technique [0002] With the rapid development and application of microwave technology, this technology has brought many conveniences to human life, such as mobile phones, radios, televisions, microwave ovens and various medical machinery and equipment, but these electrical equipment will generate electromagnetic radiation during use , causing certain pollution to people's living and working environment, and seriously endangering people's physical and mental health. These electromagnetic interference or radiation can also cause serious [0003] Safety accidents such as automatic control aircraft navigation crashes, automatic control failures, and distortion of information leakage. Electromagnetic environmental pollution has become the fourth largest public hazard ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/102B22F3/10H05K9/00
CPCB22F3/10H05K9/0081
Inventor 梁贺穆开洪
Owner SUZHOU CHUANGHAO NEW MATERIAL TECH CO LTD
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