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 2013 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: +1 724-776-497
4、0 (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:/www.sae.org/technical/standards/AMS7879F AEROSPACE MATERIAL SPECIFICATION AMS7879 REV. F Issued 1970-11 Reaffirme
5、d 2006-07 Revised 2013-09 Superseding AMS7879E Tungsten Carbide-Cobalt Powder RATIONALE AMS7879F is a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers tungsten carbide-cobalt in the form of powder. 1.2 Application This powder has been used typically for
6、producing plasma spray coatings to provide wear and fretting resistant surfaces, but usage is not limited to such applications. 1.3 Classification This specification defines 4 classes of tungsten carbide cobalt powder Class 1 Cast (fused) and crushed Class 2 Sintered and crushed Class 3 Composite Cl
7、ass 4 Other as specified When no class is specified, Class 1 shall be supplied. 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 to a subsequent revision o
8、f 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 INTERNATIONAL AMS7879F Page 2 of 4 2.1 ASTM Publications Available from ASTM Internat
9、ional, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19248-2959, Tel: 610-832-9585, www.astm.org. ASTM B 214 Sieve Analysis of Granular Metal Powders ASTM B 215 Sampling Finished Lots of Metal Powders 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight
10、shown in Table 1, determined by methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon Cobalt Iron Tungsten 3.90 10.00 - remainder 4.30 12.00 2.00 3.2 Condition Class 1 Cast (fused) and crushed Class 2 Sintered and crushed Class 3 Composite Class 4 Other manufacturing process
11、as specified 3.3 Properties Powder shall conform to the following requirements: 3.3.1 Particle Size Distribution Powder shall be supplied with the particle size distribution shown in Table 2. Sieve analysis shall be conducted in accordance with ASTM B 214; subsieve (micron) analysis shall be conduct
12、ed in accordance with a method approved by purchaser. TABLE 2 - PARTICLE SIZE DISTRIBUTION Mesh or Micron Size* Percent By Weight min Percent By Weight max -270 mesh (46 m) +325 mesh (45 m) - 20 m - 5 m * + indicates retained on sieve - indicates passing through sieve 100.0 - 70.0 - - 0.5 - 10 3.3.2
13、 Plasma Spraying Powder shall produce acceptable spray coatings; standards for acceptance and method of test shall be agreed upon by purchaser and vendor. SAE INTERNATIONAL AMS7879F Page 3 of 4 3.4 Quality Powder, as received by purchaser, shall be thoroughly blended, uniform in color and quality, d
14、ry, and free from foreign materials and from imperfections detrimental to its spraying qualities. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of powder shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purc
15、haser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the powder conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests All technical requirements except 3.3.2 (plasma spraying) are acceptance tests, and shall be pe
16、rformed on each heat or lot as applicable. 4.2.2 Preproduction Tests All technical requirements are 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 ingredients and/or processing requires approval by the cognizant
17、engineering organization (See 4.4.2), and when purchaser deems confirmatory testing to be required. 4.3 Sampling and Testing Shall be in accordance with ASTM B 215; sufficient powder shall be taken from each lot to perform all required tests. The number of determinations for each requirement shall b
18、e as specified in the applicable test procedure or, if not specified therein, not less than three. 4.3.1 When a statistical sampling plan has been agreed upon by purchaser and vendor, sampling shall be in accordance with such plan in lieu of sampling as in 4.3 and the report of 4.5 shall state that
19、such plan was used. 4.4 Approval 4.4.1 The process and control procedures, a preproduction sample, or both, whichever is specified, shall be approved by the cognizant engineering organization before production powder is supplied. 4.4.2 The supplier shall make no significant change in ingredients, pr
20、ocesses, or controls from those on which the approval was based, unless the change is approved by the cognizant engineering organization. A significant change is one that, in the judgment of the cognizant engineering organization, could affect the properties or performance of the powder. 4.5 Reports
21、 The vendor of powder shall furnish with each shipment a report showing the results of tests for composition, the powder class and particle size distribution of each lot and stating that the powder conforms to the other technical requirements. This report shall include the purchase order number, lot
22、 number, AMS7879F, vendors product designation, and quantity. 4.6 Resampling and Retesting If any sample used in the above tests fails to meet the specified requirements, disposition of the powder may be based on the results of testing three additional samples for each original nonconforming sample.
23、 Failure of any retest sample to meet the specified requirements shall be cause for rejection of the powder represented. Results of all tests shall be reported. SAE INTERNATIONAL AMS7879F Page 4 of 4 5. PREPARATION FOR DELIVERY 5.1 Packaging and Identification 5.1.1 Powder shall be packaged in 5-pou
24、nd (2.3-kg) sealed containers to protect it from contamination during shipment and under normal dry storage conditions. Seals used on containers shall be so designed that they must be destroyed in order for the container to be opened. 5.1.2 Each individual container shall be legibly identified with
25、not less than the following information, using characters that will not be obliterated by normal handling: TUNGSTEN CARBIDE-COBALT POWDER, CLASS as applicable AMS7879F MANUFACTURERS IDENTIFICATION PURCHASE ORDER NUMBER QUANTITY LOT NUMBER 5.1.3 Containers of powder shall be prepared for shipment in
26、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. 6. ACKNOWLEDGMENT A vendor shall include this specification number and its revision lett
27、er 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 A change bar (|) located in the left margin is for the convenience of the user in locating a
28、reas 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, including technical revisions. Change bars and (R) are not used in original publications, nor i
29、n documents that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary: dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.4 Purchase documents should specify not less than the following: AMS7879F Quantity of powder desired Class of powder desired (See 1.3) Plasma spray acceptance standards and methods for testing (See 3.3.2). PREPARED BY AMS COMMITTEE “G“
