SAE AMS 2525D-2013 Graphite Coating Thin Lubricating Film Impingement Applied《薄膜润滑膜撞击应用石墨涂层》.pdf
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1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS2525D AEROSPACE MATERIAL SPECIFICATION AMS2525 REV. D Issued 1972-05 Reaffirmed 2007-11 Re
5、vised 2013-07 Superseding AMS2525C Graphite Coating, Thin Lubricating Film Impingement Applied RATIONALE This revision results from a Five Year Review and includes changes for consistency with other AMS impingement coating documents. 1. SCOPE 1.1 Form This specification covers a coating consisting o
6、f finely-powdered graphite in a heat-resistant inorganic binder. 1.2 Application This coating has been used typically on metal parts and selected nonmetallic materials requiring a coating under 0.0001 inch (2.5 m) thick (See 8.4) for reducing friction or wear or for minimizing galling, but usage is
7、not limited to such applications. 1.2.1 Aluminum, magnesium, and ferrous alloys, other than corrosion-resistant types, either coated or in contact with other parts having this coating, may be susceptible to corrosion. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and p
8、rocesses described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous material
9、s and to take necessary precautionary measures to ensure the health and safety of all personnel involved. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work
10、to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. SAE AMS2525D Page 2 of 6 2.1 ASTM Publications Available from A
11、STM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D 1186 Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to a Ferrous Base ASTM D 2510 Adhesion of Solid Film Lubricants ASTM D 2714 Calibra
12、tion and Operation of the Alpha Model LFW-1 Friction and Wear Testing Machine 3. TECHNICAL REQUIREMENTS 3.1 Coating Material Shall consist of finely-powdered graphite in a heat-resistant inorganic binder. The coating, properly applied, shall form a lubricating film conforming to the requirements of
13、3.3. 3.2 Procedure 3.2.1 Cleaning Before applying the coating, surfaces of the basis material shall be thoroughly cleaned. The cleaned surfaces shall be free from oxides and from foreign materials detrimental to coating adhesion. 3.2.2 Masking (and removal) For parts with surfaces on which coating i
14、s not permitted, masking shall be applied (and removed after coating) by a method that will not change the properties of the base material or the applied coating. External shielding between the impingement nozzle and the part may be used instead of masking the part if its effectiveness can be demons
15、trated by inspection. 3.2.3 Surface Finishing Surfaces of parts to be coated shall be honed with 120 to 400 mesh aluminum oxide powder to prepare the basis material for coating. 3.2.3.1 To provide the proper surface for bearing applications, remove all residual metallic particles, whether mechanical
16、ly or electrostatically held. The cleaning method may be the same or different from the one used in 3.2.1, depending on suitability. 3.2.4 Coating The coating material shall be applied to all specified surfaces by spraying at high velocity (impinging) under controlled conditions. 3.2.5 Curing Curing
17、 shall be performed at a temperature not exceeding 310 F (154 C). 3.2.6 Preservation Unless otherwise specified by purchaser, after curing, a supplementary preservative treatment shall be applied to metallic parts subject to corrosion. The preservative treatment shall be removable by a suitable degr
18、easing method. SAE AMS2525D Page 3 of 6 3.3 Properties The coating shall conform to the following requirements: 3.3.1 Adhesion A pressure-sensitive film-backed tape, with an adhesion of not less than 45 ounces per inch (12.5 N/25.4 mm), shall be applied to a flat surface of a coated specimen, rolled
19、 in place, and then rapidly removed in accordance with ASTM D 2510, Procedure B. The lifting of flakes or particles of the coating from the specimen exposing the basis metal is not acceptable. A uniform deposit of powdery material clinging to the tape is acceptable. 3.3.2 Thickness Shall be not grea
20、ter than 0.0001 inch (2.5 m), determined in accordance with ASTM D 1186 or by a method acceptable to purchaser when ASTM D 1186 is not applicable, for example, on a non-magnetic substrate or one for which the stated method is not practical. 3.3.3 Wear Life Average of specimen time to failure shall b
21、e not less than 5 minutes average, determined in accordance with ASTM D 2714, Procedure A, and the following: 3.3.3.1 Prepare specimens in accordance with 3.2 excluding the application of the preservative coating (3.2.6). 3.3.3.2 Prepare the wear tester in accordance with ASTM D 2714, Procedure A. 3
22、.3.3.3 Load coated specimens (ring and block) on the wear tester, adjust counters to zero and run the tester for 5 seconds 3 to ensure alignment of the ring and block 3.3.3.4 Place a one-pound (454 gram) weight on the bale rod and run the tester for 60 seconds 5. 3.3.3.5 Place a second one-pound (45
23、4 g) weight on the bale rod and run to failure. Total test time shall include the time accumulated in 3.3.3.4 and 3.3.3.5. 3.3.4 Thermal Stability Heat specimen to 2000 F 25 (1093 C 14) and hold at temperature for 5 minutes 0.5, air cool to room temperature and hold for 60 minutes 5, followed by imm
24、ersion in liquid nitrogen for 60 minutes 5. Remove the specimens from the liquid nitrogen and permit the specimen to return to room temperature. Visual examination shall show no evidence of damage to the coating. 3.3.5 Appearance The coating shall be uniform, charcoal gray to black in color with blu
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