SAE AMS 7882C:2020 free download

05-25-2021 comment

SAE AMS 7882C:2020 download.Tungsten Carbide-Cobalt Chrome Powder Agglomerated and Sintered.
AMS7882C prohibits unauthorized exceptions (3.5), revises classification of tests (4.2), reports (4.5.1). and identification
(5.1.3), and results from a Five-Year Review and update of this specification.
1. SCOPE
1.1 Form
This specification covers tungsten carbide-cobalt chrome in the form of powder.
1.2 Application
This powder has been used typically for producing thermal spray coatings to provide wear and fretting resistant surfaces with a high level of corrosion resistance, but usage is not limited to such applications.
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 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.
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.
AMS2448 Application of Tungsten Carbide Coatings on Ultra-High Strength Steels, High Velocity Oxygen/Fuel Process
ARPI917 Clarification of Terms Used in Aerospace Metals Specifications
3.2 Condition shall be as manufactured.
3.3 Properties
Powder shall conform to the following requirements:
3.3.1 Particle size distribution shall be as shown in Tables 2 or 3. Each lot shall show the cumulative Table 2 volume percentages when measured by laser light scattering method in accordance with ASTM B822 or other method permitted by the cognizant engineering organization. See 8.2. Alternatively, for Method 1, 2, or 3 powder, each lot shall have the cumulative Table 3 weight percentages by sieve size using ASTM MNL32 as a guide or other method permitted by the cognizant engineering organization. (Sieve size evaluation is not applicable to Method 4 powder.) Required distribution percentages vary by application method. See 8.3.
3.5 Exceptions
Any exception shall be authorized by purchaser and reported as in 4.5.1
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for Inspection
The supplier of powder shall provide all samples for supplier’s tests and shall be responsible for the performance of all required tests. The cognizant engineering organization 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 (spraying capability) are acceptance tests, and shall be performed 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 engineering organization (see 4.4.2), and when the cognizant engineering organization deems confirmatory testing to be required.
4.2.3 Periodic Tests
Spraying capabiity (3.3.2) is a periodic test and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser.
4.3 Sampling and testing shall be iii accordance with ASTM B215 or alternative in accordance with 4.3.1. 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 therein, not less than three.
4.3.1 The cognizant engineering organization and supplier may agree upon an alternative statistical sampling plan.
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 If the supplier makes a significant change to any ingredient, process, or control from that which was used for approval, all tests shall be performed and the results submitted to the cognizant engineering organization for reapproval. A significant change is one which, in the judgment of the cognizant engineering organization, could affect the properties or performance of the powder.
4.5 Reports
The supplier of a powder shall furnish with each shipment a report showing the results of tests for composition and particle size distribution of each lot and stating that the powder conforms to other technical requirements. The report shall include the purchase order number, lot number, AMS7882C, suppliers product designation, quantity, and the details of any alternative sampling plan established in accordance with 4.3.1.
4.5.1 When material produced to this specification has authorized exceptions taken to the technical requirements listed in Section 3 (see 5.1.1), the report shall contain a statement ‘This material is certified as AM57882C(EXC) because of the following exceptions:” and the specific exceptions shall be listed.
4.6 Resampling and Retesting
II any sample used in the above lests tails to meet the specified recjirements. disposition of the powder may be based on the results of testing three additional samples for each orinal noncontorrnuig sample. Faikøe ci any retest sample to meet the specfied requirements shall be cause for resection of the powder represented. Results ci all tests shall be reported.
5. PREPARAT1ON FOR DELIVERY
5.1 Packageig and Identification
5,1 1 Powder shall be packaged In sealed containers to protect It from contamination during shipment and sider 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 th not less than the follosing information. using characters that wdl not be obliterated by normal hanng:
TUNGSTEN CARBID€.COBALT CHROME POWDER
AMS7882C
MANUFACTURERS IDENTIFICATiON
PURCHASE ORDER NUMBER
QUANTITY
LOT NUMBER
5.1.3 When technical exceptions are taken (see 4.5.1), the matenal shall be marked with AMS7882CEXC).
5.1.4 Containers of powder shall be prepared for shipment in accordance with commercial practice and in corspliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the powder to ensta’e carrier handing and safe delIvery.
6. ACKNOWLEDGMENT
A supplier shall mention AMS78S2C in all quotations and when acknowledging purchase orders.
7. REJECTIONS
Powder not conforming to this specification, or to modifications authofliod by the cognizant engineering organization, will be subject to rejection.
8. NOTES
8.1 Revision ln*cator
A change bar (I) located in the left margin is for the convenience of the user in locating ereas where technical revisions, not editorial changes, have been made to the previous Issue of this document An 1k) symbd to the left ci the document title indicates a complete revision of the document inchiding technical revisions. Change bars and (R) are not used at original publications, nor in documents that contain editorial changes only.
8.2 Micsvtrac Analysis
A specific method of particle parameter determination using low angle forward anddor 90 degree light scattering (Fraunhofler DiffractIon) and associated instrumentation, data reduction hardware and software.
8.3 Application Methods
Method I designates powder materials typically sprayed wth a SuIzerMetco Diamond Jet IIVOF thermal spray system. Method 2 designates powder materials typically sprayed with a Praxair/Tafa HVOF thermal spray system. Method 3 designates powder malenats typicaly sprayed with a Deloro Ste4ite Jet Kote8 KVOF thermal spray system, Method 4 designates powder materials typicaly sprayed with either a Sulzer$*etco Diernond Jet or Deloro Steltite Jet Kote€) II VOF thermal spray system.
8.4 Method 4 powder materials are for specifically engineered HVOF coatings designed for fatigue critical applications with 1-IVOF thermal spray equipment.
8.5 Terms used in AMS are daflfied in ARP1917.
8.6 Dimensions and properties in indlipound units arid 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.
8.7 Unless othense specified. the material producer shall work to the revision of this specification (AMS7882) in effect on tile dale of order placement, Unless otherwise specified, matenal manufactured and certified to the immediately previous revision of this specmcabon (AMS7882) may be procured and used unal inventory is depleted.
88 Purchase doctiniants should speofy not less then the following:
AMS7882C
Quantity of powder desired
Alternative thermal spray reciIrements and sampling plan, as applicable (see 33.2 and 4.3.1).

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