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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this p
3、ublication may 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
4、 (outside USA)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:/standards.sae.org/AMS7875F AEROSPACEMATERIAL SPECIFICATIONAMS7875 REV. F Issued 1970-11 Reaffirmed 2004-12 Revised
5、2017-06 Superseding AMS7875E Powder, Chromium Carbide Plus Nickel-Chromium Alloy 75Cr3C2 + 25 (80Ni - 20Cr Alloy) RATIONALE AMS7875F revises Reports (4.5) and Identification (5.1.2), and is a Five-Year Review and update of this specification. 1. SCOPE1.1 Form This specification covers a blend of chr
6、omium carbide and a nickel-chromium alloy in the form of powder. 1.2 Application This product has been used typically for producing plasma spray coatings to provide wear and fretting resistant surfaces, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTSThe issue of the following
7、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 to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding docu
8、ment has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. ARP1917 Clarification of
9、Terms Used in Aerospace Metals Specifications 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM B214 Sieve Analysis of Metal Powders ASTM B215 Sampling Metal Powders SAE INTERNATIONAL
10、AMS7875F Page 2 of 5 ASTM C1070 Determining Particle Size Distribution of Alumina or Quartz by Laser Light Scattering ASTM E354 Chemical Analysis of High-Temperature, Electrical, Magnetic, and Other Similar Iron, Nickel, and Cobalt Alloys ASTM E363 Chemical Analysis of Chromium and Ferrochromium 3.
11、TECHNICAL REQUIREMENTS 3.1 Material Shall be a blend of 74.00 to 76.00% by weight chromium carbide and 24.00 to 26.00% by weight nickel-chromium alloy powders. The component powders, prior to blending, shall conform to the compositions of 3.2.1 and 3.2.2, respectively, and shall have particle size d
12、istribution as shown in 3.4.1 for each component powder. 3.2 Composition Shall conform to the percentages by weight shown in Tables 1 and 2, determined by wet chemical methods in accordance with ASTM E363 for the chromium carbide and ASTM E354 for the nickel-chromium alloy, or by spectrographic or o
13、ther analytical methods approved by purchaser: 3.2.1 Chromium Carbide Table 1 - Composition Element Min Max Total Carbon 12.50 - Silicon - 0.10 Chromium 85.50 - Iron - 0.70 3.2.2 Nickel-Chromium Alloy Table 2 - Composition Element Min Max Carbon - 0.25 Manganese - 2.50 Silicon - 1.50 Chromium 18.00
14、22.50 Nickel 76.00 80.00 Iron - 1.00 3.2.3 When specified, producer shall supply purchaser with an adequate quantity of component materials (see 3.2.1 and 3.2.2) for quality control checks. 3.3 Condition As blended. SAE INTERNATIONAL AMS7875F Page 3 of 5 3.4 Properties Powder shall conform to the fo
15、llowing requirements: 3.4.1 Particle Size Distribution Each component powder shall have the particle size distribution shown in Table 3, determined before blending. Sieve analysis shall be conducted in accordance with ASTM B214; sub-sieve analysis shall be in accordance with ASTM C1070 or other opti
16、cal method agreed upon by purchaser and producer. Table 3 - Particle size distribution Chromium Carbide % by Wt Min Chromium Carbide % by Wt Max Mesh or Micron Size(1)Nickel-Chromium Alloy % by Wt Min Nickel-Chromium Alloy % by Wt Max 100 - -270 mesh (46 m) 100 - - 1 +325 mesh (45 m) - 1 50 70 -22 m
17、 45 75 - 10 -5.5 m - 5 (1) +indicates retained on sieve - indicates passing through sieve 3.4.2 Plasma Spraying Powder shall produce acceptable plasma spray coatings; standards for acceptance and method of test shall be as agreed upon by purchaser and producer. 3.5 Quality The component powders shal
18、l be thoroughly blended. The blend, as received by purchaser, shall be uniform in color and quality, dry, and free from foreign materials and from imperfections detrimental to its spraying qualities. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall
19、supply all samples for producers tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests All te
20、chnical requirements of this specification are acceptance tests and preproduction tests and shall be performed prior to or on the initial shipment of powder to a purchaser, on each lot, when a change in material, processing, or both requires reapproval as in 4.4.2, and when purchaser deems confirmat
21、ory testing to be required. 4.3 Sampling and Testing Shall be in accordance with ASTM B215; sufficient powder shall be taken from each lot to perform all required tests. The number of determinations for each requirement shall be as specified in the applicable test procedure or, if not specified ther
22、ein, not less than three. 4.3.1 A lot shall be all powder produced in a single production run from the same batches of raw materials under the same fixed conditions and presented for producers inspection at one time. A lot may be packaged and delivered in small quantities under the basic lot approva
23、l provided lot identification is maintained. SAE INTERNATIONAL AMS7875F Page 4 of 5 4.3.2 When a statistical sampling plan and acceptance quality level (AQL) have been agreed upon by purchaser and producer, sampling shall be in accordance with such plan in lieu of sampling as in 4.3 and the report o
24、f 4.5 shall state that such plan was used. 4.4 Approval 4.4.1 Sample powder shall be approved by purchaser before powder for production use is supplied, unless such approval is waived by purchaser. Results of tests on production powder shall be essentially equivalent to those on the approved sample.
25、 4.4.2 Producer shall use materials, processing techniques, and methods of inspection on production powder that are essentially the same as those used on the approved sample powder. If necessary to make any change in ingredients, processing techniques, or methods of inspection, producer shall submit
26、 for reapproval a statement of the proposed changes in material, processing, or both and, when requested, sample powder. Production powder made by the revised procedure shall not be shipped prior to receipt of reapproval. 4.5 Reports The producer of powder shall furnish with each shipment a report s
27、howing the results of tests for composition and the particle size distribution of each lot and stating that the powder conforms to the other technical requirements of this specification. This report shall include the purchase order number, AMS7875F, producers product designation, lot number, and qua
28、ntity. 4.5.1 When material produced to this specification has exceptions taken to the technical requirements listed in Section 3 (see 5.1.2), the report shall contain a statement “This material is certified as AMS7875F(EXC) because of the following exceptions:” and the specific exceptions shall be l
29、isted. 4.6 Resampling and Retesting If any sample used in the above tests fails to meet the specified requirements, disposition of the product may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specif
30、ied requirements shall be cause for rejection of the product represented. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Packaging and Identification Powder shall be packaged in 5 pound (2.3 kg) sealed containers to protect it from contamination during shipment and under nor
31、mal dry storage conditions. Seals used on containers shall be so designed that they must be destroyed in order for the container to be opened. 5.1.1 Each individual container shall be identified with not less than the following information, using characters of such size as to be legible and that wil
32、l not be obliterated by normal handling: CHROMIUM CARBIDE-NICKEL-CHROMIUM ALLOY POWDER AMS7875F MANUFACTURERS IDENTIFICATION PURCHASE ORDER NUMBER QUANTITY LOT NUMBER 5.1.2 When technical exceptions are taken (see 4.5.1), the material shall be marked with AMS7875F(EXC). 5.1.3 Containers of powder sh
33、all be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the powder to ensure carrier acceptance and safe delivery. SAE INTERNATIONAL AMS7875F Page 5 of 5 6. ACKNOWLEDGMENT
34、 A producer shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Powder not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 Revision Indicator
35、A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, inc
36、luding technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatur
37、es are shown as the approximate equivalents of the primary units and are presented only for information. 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Procurement documents should specify not less than the following: AMS7875F Quantity of powder desired Plasma spray acceptance standards (see 3.4.2) PREPARED BY AMS COMMITTEE “F“
