Managing EMI and Lightning Strike Protection in Aircraft with CHO-SHIELD® 2002

时间： 2020-05-14 来源：Parker Chomerics

技术问答

Composite materials have been replacing metal structures throughout the aircraft industry primarily to save weight, improve fuel economy and reduce costs. But the lack of electrical conductivity in these materials is a disadvantage when compared to the conventional metal airframes of the past.

The conventional, metal airframe allowed designers to take advantage of the natural Faraday cage it formed to protect equipment against interference. There were many opportunities to ground items of equipment reliably by connecting directly to a convenient surface ground.

Today, a typical airframe consists of around 50% composites. Major structures include the fuselage and wing fairing, as well as large sections of the wings, fin and horizontal stabilizers.

Causes of electrical interference

Inside the aircraft there are numerous electrical systems capable of generating EMI which can potentially disturb the operation of critical systems. These include fluorescent lights, light switches, dimming circuits, AC-powered window heaters, motors and generators, data and power cables, and transmitters such as radio and radar.

External storms are also a major source of potentially disruptive electrical interference and can cause physical damage to the aircraft through lightning strike impact.

Recovering lost properties

Replacing metal structures with composites means compromising the EMI shielding and lightning strike protection of the aircraft, as the composites themselves are not electrically conductive. To overcome this issue, woven or non-woven copper-aluminium mesh, or an expanded foil, can be embedded in composite structures to restore lost shielding and grounding properties. The embedded metal provides an optimal combination of electrical conductivity, weight, and corrosion resistance. Solid metal strips can be used in the radome area to handle very high concentrations of lightning energy.

Embedded conductors, however, do not solve all the technical challenges that come with the increasing use of composites. It is very difficult to ensure reliable electrical continuity between individual composite panels after the airframe is assembled and still promote conduction of lightning energy.

Electrical components are typically bonded or grounded directly to the airframe. These connections to the mesh can often fail to meet the very low impedance requirements because of environmental stresses such as vibration and temperature variation. The exposed mesh in the locations where grounded or bonded modules are made (fig 1, at left), can be vulnerable to environmental exposure (temperature, humidity, oxidation) that increases electrical impedance.

Applied performance enhancement

To overcome this challenge, a lightweight coating such as PARKER CHOMERICS CHO-SHIELD technology can be applied to optimize conductivity in this area. CHO-SHIELD® 4994 is a highly conductive, silver-filled polyurethane coating designed for aerospace applications and has superior EMI shielding properties. The coating provides excellent adhesion and wear resistance and is resilient to most operation and environmental fluids. The coating is compatible with many primers and top coat systems.

In areas where high corrosion protection is needed, a copper-based urethane coasting such as Parker Chomerics CHO-SHIELD® 2002 can be used. When used on a composite, CHO-SHIELD 2002 provides the conductivity necessary to achieve excellent shielding effectiveness while maintaining its electrical and mechanical stability in hostile environments. CHO-SHIELD 2002 is designed to be used with Chomerics CHO-SHIELD® 1091 primer to ensure correct adhesion.

The aircraft antennas will also need to be shielded and grounded against lightning strike. This can be achieved by using an expanded woven MetalasticTM EXP-URE gasket material. Electrically conductive grease can be applied at ground connections, to support reliable electrical connectivity under temperature and vibration. Attention must be paid to viscosity and surface-wetting properties when formulating greases for aerospace applications.

Parker Chomerics CHO-LUBE® 4220 has a resistivity better than 100mΩ-cm and is an example of an aerospace-grade grease. It is formulated to support electrical interconnections, improve metal to metal contact and provide long-term oxidation protection for exposed mesh or electrical terminals.

Conductive sealants such as Parker Chomerics CHO-BOND® 2165 or CHO-BOND® 1019 can be applied at locations requiring electrical continuity and environmental protection. Typical airframe areas treated are screw holes, fasteners, antenna connection points and exposed conductors on external areas. Where conductive gaskets are used to promote electrical continuity between composite components, a conductive sealant can be applied to provide improvement in continuity. These areas are generally around the wheel wells, engine mounts, wings and the tail section, where high vibration occurs (figure 2, above).

In addition to these methods which will improve EMI performance throughout the airframe, a lightweight conductive heat shrinkable tube such as Parker Chomerics CHO-SHRINK® 1061 can be used to shield the aircraft’s cabling against the effects of EMI and can provide a weight saving of up to 60% compared to traditional methods.

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本文由翊翊所思转载自Parker Chomerics，原文标题为:Managing EMI and Lightning Strike Protection in Today’s Aircraft，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

全部评论（1）

maomao Lv8. 研究员 2020-05-14

不错的资料~~~

没有更多评论了

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选型指南 - PARKER CHOMERICS - April 2020 PDF 英文下载

Product Environmental Quality Certification

型号- CHO-SHIELD 571,THERM-A-GAP 569PT,CHO-SEAL 1285,SOFT-SHIELD 3500,SOFT-SHIELD 5000,CHO-SEAL 1401-S,CHO-SEAL V6433,CHO-SEAL 0862,THERMFLOW T725,CEL-XX-5103-XXXX,CHO-SEAL 1278,CHO-SEAL 0860,THERM-A-GAP T652,CHO-SEAL 1291,CHO-SEAL 1290,CHO-FORM 5575,CHO-THERM 1641,CHO-THERM 1646,THERM-A-GAP GEL 40,THERM-A-GAP T654,THERMATTACH T491,CHO-BOND 320,CHO-SEAL 1287,THERM-A-GAP 579KT,CHO-FORM 5560,CHO-SHIELD 596,CHO-MUTE 9000,THERM-A-GAP PAD70TP,SOFT-SHIELD 4850,FPCV-14244,THERM-A-GAP PAD30PN,CHO-FOILCCD,FPCV-13701,THERM-A-GAP F174,CHO-SHIELD 4076,THERMFLOW PC07DM-7,THERM-A-GAP GEL 40NS,CHO-SEAL 1298,CHO-SEAL 6503,CHO-SEAL 6502,CHO-MASK II CMT,CHO-THERM T609,THERM-A-GAP T630,CHO-FORM 5550,THERM-A-GAP T636,CHO-SEAL S6304,THERM-A-GAP G580,THERM-A-GAP T635,CHO-SEAL S6305,CHO-THERM T290,THERM-A-FORM 1641,THERM-A-FORM 1642,THERM-A-GAP G574,CHO-BOND 584,THERM-A-GAP 569PB,THERM-A-GAP G579,CHO-SEAL 1501,THERM-A-GAP PAD30G,THERMFLOW T710,THERM-A-GAP PAD30A,THERMAL GREASE T660,CHO-MUTE 9025,CHO-MUTE 9020,CHO-FORM 5541,CHO-FORM 5542,CHO-SEAL 6372,CHO-SEAL 6371,CHO-SEAL 6370,CHO-LUBE E117,THERM-A-GAP A580,SOFT-SHIELD 1000,THERM-A-GAP G570,THERM-A-GAP PAD60,CHO-FAB CFT,CHO-SEAL 1358,CHO-SEAL 1236,CHO-SEAL 1239,CHO-SEAL L6303,CHO-THERM T500,CHO-SEAL 1250,THERMAL GREASE T650,CHO-FOIL CCD,CHO-FOIL CCE,THERM-A-GAP T174,THERM-A-GAP A574,CHO-FOIL CCH,CHO-FOIL CCJ,CHO-FOIL CCK,THERM-A-GAP A570,THERM-A-GAP A515 RFA,CHO-FORM 5538,THERM-A-PAD-579PN,CHO-MUTE 9005,CHO-SHIELD 1091,THERM-A-GAP PAD60A,THERM-A-GAP A569,CHO-SEAL 1260,CHO-FORM 5526,CHO-FORM 5528,THERM-A-GAP GEL 8010,CHO-BOND 1099,CHO-FORM 5519,THERM-A-GAP 6579,THERM-A-GAP F574,THERM-A-GAP TPS60,THERM-A-GAP 579PN,FPCV-14832,THERM-A-GAP GEL 8017,CHO-BOND 1091,CHO-SIL 1485,CHO-JAC CJ-022-26,THERM-A-GAP 579PB,THERM-A-GAP 579,CHO-SEAL 1273,THERM-A-GAP PAD30,THERMAL GREASE T670,CHO-SIL 1356,CHO-FOIL CAD,THERM-A-GAP T274,CHO-SEAL 1270,CHO-FORM 5513,SOFT-SHIELD 2000,THERM-A-GAP 579PT,CHO-FORM 5515,CHO-SORB,THERM-A-GAP 6569,CHO-BOND 1088,TECKNIT 72-0008,THERM-A-GAP G174,CHO-LUBE4220,CHO-BOND 584-29,CHO-BOND 1083,CHO-SEAL 1265,THERM-A-GAP PAD80,CHO-BOND 1085,CHO-BOND 1086,THERMATTACH T405,CHO-SEAL 6452,CHO-SEAL 6330,THERMATTACH T404,CHO-SHRINK TUBES,CHO-LUBE 4220,CHO-BOND 360-208,CHO-SEAL 2561Y,CHO-FAB CRS,CHO-FORM 5506,THERM-A-GAP GEL 45,CHO-BOND 1076,CHO-BOND 2165,FPCV-13444,CHO-BOND 1077,CHO-SHIELD 608,THERM-A-GAP GELAB,CHO-BOND 1072,CHO-SEAL 1310,CHO-BOND 1073,CHO-SHIELD 604,CHO-BOND 1075,THERMATTACH T418,THERMATTACH T412,THERMATTACH T413,THERMATTACH T414,CHO-SEAL 6460,THERM-A-GAP 575NS,CHO-SEAL S6600,THERM-A-GAP G515 RFA,CHO-STRAP,CHO-BOND 1067,CHO-BOND 1069,THERM-A-GAP PAD70TPF,THERM-A-GAP TC60,THERMATTACH T410,THERMATTACH T411,THERMATTACH T428,CHO-SHIELD 2056,CHO-SHIELD 4916,CHO-SHIELD 4914,CHO-BOND 1055,CHO-BOND 1056,CHO-THERM T444,CHO-THERM T441,THERM-A-GAP TC50,THERM-A-FORM CIP35,CHO-SEAL 1215,CHO-SHIELD 2052,CHO-SEAL 1217,CHO-BOND 1053,CHO-SEAL 1212,CHO-SEAL 1350,THERM-A-FORM T644,THERM-A-FORM T646,THERM-A-GAP GEL 30,CHO-SHIELD 2044,THERM-A-FORM T647,CHO-SHIELD 4900,CHO-SHRINK BOOT,THERMFLOW T310,THERM-A-GAP G974,CHO-SHIELD 2040,CHO-SHIELD 610,CHO-SEAL 2557,THERMFLOW T557,CHO-SEAL 1221,CHO-SEAL 1224,THERM-A-FORM T642,THERMFLOW T558,CHO-BOND 360-20,SOFT-SHIELD 3700,CHO-SEAL 2542,THERM-A-FORM T644G,THERM-A-GAP T580,CHO-BOND 1029,THERM-A-GAP GEL20,THERM-A-GAP T630G,CHO-BOND 1035,CHO-BOND 1038,CHO-BOND 4669,CHO-BOND 592,THERMFLOW T766,CHO-BOND 1030,CHO-BOND 4660,THERM-A-GAP GEL 4517,THERM-A-GAP T574,CHO-JAC,CHO-THERM 1680,THERM-A-GAP T570,SOFT-SHIELD 4008,SOFT-SHIELD 4800,CHO-BOND 1018,CHO-BOND 1019,CHO-THERM 1684,THERM-A-GAP A174,SOFT-SHIELD 4004,SOFT-SHIELD 4002,THERM-A-GAP T579,SOFT-SHIELD 4000,SOFT-SHIELD I,TECKNIT 72-08116,CHO-BOND 1024,CHO-BOND 1027,CHO-SEAL 1401,THERM-A-GAP A579,THERMFLOW T777,THERM-A-GAP TPS60G,CHO-SEAL 6313,TECKNIT 0005,CHO-THERM 1671,TECKNIT 0002,CHO-SIL 1401,THERM-A-GAP GEL60HF,CH0-SEAL 0860,CHO-THERM 1674,CHO-THERM 1679,THERM-A-GAP T569,CHO-THERM 1677,THERM-A-GAP G274,CHO-THERM 1678,CHO-BOND 1016,THERM-A-GAP GEL37,CHO-SEAL 6308,THERM-A-GAP 976,THERM-A-GAP PAD30KT,CHO-SEAL 6307,CHO-SEAL 1651,CHO-SHIELD 2002,THERM-A-GAP GEL 75,CHO-SHIELD 2003,THERM-A-GAP 974,CHO-SHIELD 2001,CHO-THERM 1661,THERM-A-GAP A274,THERM-A--FORM CIP35,CHO-BOND 1121,THERM-A-GAP HCS,CHO-SEAL1285,CHO-SEAL 6435

测试报告 - PARKER CHOMERICS - 3/12/2023 PDF 英文下载

【产品】CHO-SEAL®增强型橡胶屏蔽密封圈，以涤纶织物或金属层加固，能够提供极佳的机械强度

在既需要保留导电橡胶的弹性和密封性，又需要耐受极大机械强度的应用中，例如飞机的机身、舱门、翼板等应用环境，就不能使用普通的密封圈产品。Parker Chomerics为类似这样的特殊应用需求，专门开发了一种增强型橡胶屏蔽密封圈产品CHO-SEAL®。该产品采用导电橡胶材料为基础，增加涤纶织物或金属丝网结构进行加固，生产上采用整体塑模工艺，在提供增强的机械性能同时，还能保留导电橡胶的电气性能。

新产品发布时间 : 2019-04-26

【产品】专为铝质基板应用设计的导电涂料CHO-SHIELD® 2001/2003

铝质基板是最常用的轻型金属基板，在各种车载、航空及船舶行业中经常使用。派克固美丽根据铝质基板的特点，专门开发了CHO-SHIELD® 2001和CHO-SHIELD® 2003两款导电涂料产品。这两款产品都是以聚氨酯涂料为基质，添加纯铜微粒和可溶性铬酸盐制成。聚氨酯涂料具有涂层薄、强度高的优点，耐磨、耐刮擦；纯铜微粒导电填料，屏蔽效能均大于80dB；且含有可溶性铬酸盐，专为铝质基板应用而设计。

新产品发布时间 : 2019-05-26

EU REACH ARTICLE SVHC DECLARATION OSHA ARTICLE SAFETY DATA SHEET

型号- CHO-BOND 1024,THERM-A-GAP T274,CHO-BOND 1027,CHO-MUTE 9020,THERMFLOW T766,CHO-MUTE 9025,CIP 210,CHO-BOND 1019,SOFT-SHIELD 2000,CEL-XX-5103-XXXX,THERM-A-GAP 976,THERM-A-GAP 974,THERM-A-GAP A569,CON-SIL A,THERMFLOW T777,THERM-A-GAP F574,CHO-SHIELD 596,CHO-THERM T500,CHO-BOND 360,THERM-A-GAP HCS,THERM-A-GAP A579,THERM-A-GAP A574,THERM-A-GAP T174,THERM-A-GAP A570,PREMIER AB140FR,FPCV-14244,FPCV-13701,CHO-BOND 592,THERM-A-GAP 579PT,CHO-BOND 1035,THERM-A-GAP TPS60,CHO-SEAL V6433,CHO-SEAL 1290,THERM-A-GAP 579PB,CHO-BOND 1030,THERM-A-GAP G570,THERM-A-GAP A580,THERM-A-GAP T579,CL-130,THERM-A-GAP G569,CHO-BOND 584,SOFT-SHIELD 1000,CHO-BOND 1029,72-08116,THERM-A-GAP T630,CHO-BOND 1067,CHO-BOND 1069,CHO-THERM 1661,CHO-SEAL L6303,THERM-A-GAP T636,THERM-A-GAP T635,THERM-A-GAP G580,THERMATTACH T491,CHO-SEAL 1285,CONSIL NC,CHO-SEAL 0860,THERM-A-GAP G574,CHO-SEAL 0862,THERM-A-GAP G579,THERM-A-FORM 1642,THERM-A-FORM 1641,THERM-A FORM T644,CIP 250,THERM-A-GAP GEL30,CHO-THERM 1679,CHO-BOND 1056,THERMAL GREASE T650,CHO-BOND 1055,CHO-THERM 1677,CHO-THERM 1678,CHO-THERM 1674,CHO-THERM 1671,CHO-BOND 1053,THERM-A-GAP 569PT,CHO-FAB CFT,CHO-LUBE 4220,CHO-FORM 5513,SOFT-SHIELD 4850,CHO-FORM 6600,CHO-FORM 5515,THERM-A-GAP T652,CHO-THERM T290,THERM-A-GAP 569PB,CHO-THERM 1684,THERM-A-GAP TPS60G,CHO-MUTE 9000,CHO-THERM 1680,CHO-SHIELD 610,CHO-BOND 1086,CHO-THERM T609,THERM-A-GAP T654,CIP 110,CHO-SHIELD 4076,THERM-A-GAP T630G,CJ-022-26,CHO-SHIELD 608,THERMFLOW T310,PREMIER APEI-140,CHO-BOND 1076,CHO-BOND 2165,THERMAL GREASE T670,SOFT-SHIELD 5000,CHO-SHIELD 604,THERMFLOW T557,CHO-BOND 1073,CHO-BOND 1072,THERMFLOW T558,PREMIER A240-FRHF,CHO-MUTE 9005,THERM-A-GAP 579KT,CHO-SEAL S6600,SOFT-SHIELD 3500,CHO-SEAL 6370,THERM-A-GAP A274,CHO-SEAL 6372,THERM-A-GAP F174,FPCV-13444,CHO-SEAL 1356,CHO-SEAL 1236,CHO-FORM 5541,THERM-A-GAP 579,CHO-SHIELD 2002,CHO-FAB CRS,CHO-BOND 1091,THERM-A-GAP TS15,THERM-A-GAP T569,THERM-A-GAP G274,CHO-SEAL 1221,PRIMER 1083,CHO-FORM 5550,PRIMER 1088,PRIMER 1085,CHO-THERM 1646,CHO BOND 4660,CHO-FORM 5506 FIP-C,CHO-FORM 5519,THERM-A-GAP T574,THERM-A-GAP GEL45,THERM-A-GAP T570,XTS8010,THERM-A-GAP A174,THERM-A-GAP T579,TC60,CHO-SEAL 1212,SOFT-SHIELD 4008,SOFT-SHIELD 4800,THERMFLOW PC07DM-7,CHO-SEAL 1217,SOFT-SHIELD 4002,SABIC C6200,SOFT-SHIELD 4000,CHO-FORM 5528,CHO-FORM 5526,SOFT-SHIELD 4004,THERM-A-FORM CIP35,THERM-A-GAP T580,THERM-A-GAP G515 RFA,CHO-SEAL 6460,TC50,THERM-A-GAP G174,PREMIER A220,SOFT-SHIELD 3700,PREMIER A225,R4013-24-C,THERMATTACH T410,THERMATTACH T411,CHO-SEAL 6452,THERM-A-FORM T646,CHO-SEAL 6330,THERMFLOW T725,XTS8030,CHO-MASK II CMT,THERM-A-FORM T647,PREMIER A230,THERM-A-FORM T642,PREMIER A235,CHO-BOND 4669,THERM-A-GAP G974,THERMATTACH T414,THERM-A-GAP 575NS,THERMATTACH T412,THERMATTACH T413,THERMATTACH T418,THERM-A-FORM T644G,CHO-FOIL CCK,CHO-FOIL CCJ,CHO-JAC,PARPHORM 1945,THERM-A-GAP GELAB,CHO-SHIELD 2044,CHO-FOIL CCD,CHO-SHIELD 4900,CHO-FOIL CCH,CHO-FOIL CCE,CHO-SEAL 6435,PREMIER A240,CIP 300,THERMATTACH T404,CHO-SEAL S6304,THERMATTACH T405,CHO-BOND 1121,TW10,CHO-SHIELD 2056,CHO-SHIELD 4914,CHO-SHIELD 4916,CHO-SEAL 6313,CHO-FORM 5560,CHO-SEAL 6307,PRIMER 1099,CHO-SHIELD 2052,THERM-A-GAP A515 RFA,PARPHORM 1800,THERMFLOW T710,CHO-FOIL CAD,CHO-SHIELD 571,PREMIER A240EC,TPS60G,CHO-SEAL 1401,CHO-THERM T441,CHO-THERM T444,THERMATTACH T428,CHO-SHIELD 1091

测试报告 - PARKER CHOMERICS - 4/3/20 PDF 英文下载

Key Facts About Parker FY2019

型号- CHO-FORM 5550,SOFT SHIELD 4850,CHO-FORM 5552,CHO-BOND® 584-29,THERM-A-GAP GEL,CHO-FORM 5538,CHO-MUTE 9025,CHO-MUTE 9005,SOFT-SHIELD 3700,SOFT-SHIELD 4800,CHO-BOND® 1075,CHO-BOND® 580-208,SOFT-SHIELD 4850,CHO-FORM® 5528,CHO-SEAL 2557,CHO-SEAL 2532,SOFT-SHIELD 3500,CHO-BOND® 1038,CHO-SEAL 2542

商品及供应商介绍 - PARKER CHOMERICS PDF 英文下载

CHO-SHIELD® 2002, Part A SAFETY DATA SHEET

型号- 52-03-2002-0000,52-04-2002-0000,52-00-2002-0000,52-01-2002-0000,52-00-2002-1000,CHO-SHIELD® 2002

测试报告 - PARKER CHOMERICS - Revision 2 - 12/06/2017 PDF 英文下载

CHO-SHIELD® 2000 SERIES Corrosion-Resistant Conductive Coatings

型号- 52-01-2001-0000,CHO-SHIELD 2002,52-04-2002-0000,CHO-SHIELD 2003,CHO-SHIELD 2001,52-00-2002-1000,CHO-SHIELD® 2001,CHO-SHIELD® 2000,52-01-2003-0000,CHO-SHIELD® 2003,CHO-SHIELD® 2002,52-00-2002-0000,CHO-SHIELD® 2000 SERIES,52-04-2001-0000,52-00-2003-0000,52-00-2003-1000,52-04-2003-0000,52-01-2002-0000,52-00-2001-0000,52-00-2001-1000

数据手册 - PARKER CHOMERICS - July 2023 PDF 英文下载