1、I .- MIL-Z-81572 b 99979Ob 0322859 O H - MIL-Z-81572 (AS) 26 January 1968 MILiTARY SPECIFICATION ZIRCONIUM OXIDE, LIME-STABIIJZED, POWDER AND ROD, FOR FLAME SPRAYING This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1. SCOPE 1.1 Scope - This specification
2、 covers the requirements of lime-stabilized zirconium ozide (zirconia) as powder or rod for use with flame spraying processes. 1.2 Classification - 1.2.1 Types, grades and classes - Lime-stabilized zirconium oxide (zirconia) shall be furnished in the following types, grades and classes, as speci- fi
3、ed (see 6.2): Type I - Powder (see 3.1.1) Grade A - Sintered (see 3.1.1.1) Class 1 - For combustion (oxy-acetylene) flame spraying Class 2 - For plasma-arc flame spraying Grade B - Fused (see 3.1.1.2) Class 1 - For combustion (oxy-acetylene) flame spraying Class 2 - For plasma-arc flame spraying Typ
4、e II - Rod (see 3.1.2) 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, frm a part of the specification to the extent speci- fied herein. . -. I FSC 6810 I i 1 h Provided by IHSNot for ResaleNo reproduction or networki
5、ng permitted without license from IHS-,-,-MIL-Z-1572 68 9779906 O1228b0 7 m I MIL-Z-8l572 (AS) I SPECIFICATIONS Federal RR-S-366 STANDARDS Military MIL-STD-105 MILSTD-129 MILSTD-1233 Sieves, Standards for Testing Purposes Sampling Procedures and Tables for Inspeotion by Attributes Marking for Shipme
6、nt and Storage Procedures for Determining Particle Size, Particle Size Distribution and Packed Density of Powdered Materials (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring
7、activity or as directed by the contracting officer.) 2.2 Other publications - The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. American Society
8、 for Testing. and Materials Publications ASTM B 214 Methods of Test for Sieve Analysis of Granular Metal Powders ASTM C 369 Method of Test for Modulus of Rupture of Fired, Cast or Extruded Whiteware Porducts ASTM D 116 Methods of Testing Vitrified Ceramic Materials for Electrical Applications (Appli
9、cation for copies of A. S. T. M. standards should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_- MIL-Z-81572 68 W 7777906 01228
10、b1 7 = MIL-Z-81572 (AS) f 3. REQUIREMENTS 3.1 Material - Zirconium oxide (zircoda) shall be a product suitable for flame spraying and so formulated as to meet the requirements specified herein. The zirconia shall be stabilized with calcium oxide (lime) so that the resultant characteristic crystal st
11、ructure will be cubic. 3.1.1 Powder (Type I) - Zirconia powder (Type I) shall be either Grade A or Grade B as specified in the contract or purchase order (see 6.1.2). 3.1.1.1 Grade A - Grade A zirconia powder shall be produced by sintering to a temperature of approximately 2600 F (1425 C) without co
12、mplete melting or fusing. 3.1.1.2 Grade B - Grade B zirconia powder shall be produced by fusing to slightly above the melting point of approximately 4800 F (2650 C). 3.1.2 Rod (Type II) - Unless otherwise specified in the contract or pur- chase order, rods (Type II) shall be produced from fused lime
13、-stabilized zirconia. 3.2 Chemical composition - Unless otherwise specified, zirconia shall conform to the requirements for chemical composition specified in Table I when tested in accordance with 4.5.4. TABLE I CHEMICAL COMPOSITION, PERCENT BY WEIGHT Type I, Grade A (Powder, Sintered) COMPOSITION Z
14、irconium oxide (ZrO2) L/ Calcium oxide (Cao) Magnesium oxide (Ma) Silicon oxide (Si02) Aluminum oxide (Al2O3) Titanium oxide (TiO2) Ferric oxide (Fe203) Other oxides, each z/ Total other oxides z/ - i/ The zirconia may includ determined as zirconiun Type I, Grade B or Type. (Powder or Rod, Fused) 92
15、. O Min. 1.40 Max. O. 80 Max. 0.60 Max. 0.40 Max. O. 30 Max. o. 20 Max. 0.60 Max. 4.50-5.50 a maximum of 3 percent hafnium oxide (Hf02) oxide (ZrO2). ) 92. O Min. O. 50 Max. O. 80 Max. 1.00 Max. 0.40 Max. O. 50 Max. O. 20 Max. O. 60 Max. 3.50-5.00 - 2/ Need not be determined. 3 - Provided by IHSNot
16、for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-Z-L572 b m 9779906 0322862 O m SIEVE “IBERA/ 140 200 270 325 - HIEZ-8l572 (AS) I PERCENT THROUGH MICRON OPENING CLASS 2 105 - 99. O Min. 74 99. O Min. 85. O MTn. 53 90.0 Min. - 44 70. O Min. 25. O Max. 10 8.0 Max. - C
17、LASS 1 3.3 Loss on ivnition - The loss on ignition of Type I zirconia (powder), either Grade A or Grade B, shall not be more than O. 50 percent when determined in accordance with 4.5.5. 3.4 Particle size of powder - Unless otherwise specified, the Type I zirconia (powder), either Grade A or Grade B,
18、 shall conform to the particle size req 2 for diameter and conformance to 3.6 for configuration. 4.5.2 Straightness - The sample rods selected in accordance with 4.3.2.1 shall be measured to determine conformance to 3.7. The measurement shall be taken by placing a rod on a straight edge and measurin
19、g the greatest distance and the mas- hum depth of arc between the straight length edge of the rod and the straight edge. At the option of the supplier any other procedure such as a warpage gage may be employed for measuring of straightness. This is essentially an adjustable slope table containing th
20、ree knife edges adjusted to accommodate the various lengths of rod. A bar is attached over the knife edges which can be raised or lowered to set the allowable straightness tolerances by means of stop and feeler gages. Rods are rolled down the table to pass under the tolerance bar. Rods which a0 not
21、pass freely under the bar shall be rejected. 4.5.3 Squareness of ends - The sample rods selected in accordance with 4.3.2.1 shall be measured to determine conformance to 3.8. The squareness of the - .- 7 -* Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
22、-,-,-MIL-2-81572 (AS) ends shall be measured for any deviation of the end area from a straight line at right-angle to the length and touching the corner. . 4.5.4 Chemical composition - The samples selected in accordance with 4.3.1.2 or 4.3.2.2 shall be tested using suitable standard wet chemical or
23、spectro- graphic methods to determine conformance to 3.2 and the chemical requirements of Table I. In case of dispute, the chemical analysis by wet chemical methods shall be the basis for acceptance. 4.5.5 Loss on ignition - The samples selected in accordance with 4.3.1.2 shall be tested for loss on
24、 ignition to determine conformance to 3.3. Samples shall be dried for 2 hours in an oven at 105“ to 110“ C (221“ to 230“ F) and cooied in a desiccator to,room temperature. About 10 grams of material shall be weighed immediately to the nearest thousandth of a gram upon removal from the desiccator. Th
25、e specimen material shall be heated to constant weight in an electric muffie furnace at 900“ to 1000“ C (1652“ to 1832“ F). The ignition loss shall be calculated from the loss in weight. 4.5.6 Particle size of Type I material - 4.5.6.1 Class 1 - The sample of zirconia powder selected in accordance w
26、ith 4.3.1.2 shall be tested for particle size distribution by sieve analysis using the pro- cedure specified in MILSTD-1233, Method 300, except that the shaking device shall be operated for 15 minutes, or as specified in ASTM B 214. The amounts of material retained on the sieves and bottom pan shall
27、 be weighed, Weigh out accurately O. 1 to O. 2 gram of the powdered zirconium oxide from the pan (portion that passed through the No. 325 sieve) into a beaker. Add 4 to 5 drops of a 4 percent tetra sodium pyrophosphate solution (Na4P207 . 10H20), and 250 milliliters of a 1 percent sodium chloride so
28、lution (NaCl), to the material in the beaker. The beaker and contents shall then be placed on a Coulter Electrical Sensing-Zone Particle Analyzer. Counts shall be performed at 5, 10, 15, 20, 25, 30, 35, and 40 microns. The direct frequency data shalI be converted by plotting the particle diameter in
29、 microns versus the weight per- cent above stated size (cumulative weight) in order to calculate the size distribution of the material which passed through the No. 325 sieve. Calculate and correct the final results to determine confoirnance to Table II. At the option of the supplier, other equipment
30、 may be used for determining the precise size measurements of. the fine powder if capable of determining particle sizes between 2 to 50 microns. 4.5.6.2 Class 2 - The sample of zirconia powder selected in accordance with 4.3.1.2 shall be tested for particle Bize distribution by sieve analysis using
31、the pro- cedure specified in MILSTD-1233,. Method 300, except that the shaking device shall be operated for 15 minutes or as specified in ASTM B 214. The amounts of materials re- tained on the sieves and bottom pans shall be weighed to calculate percentage to deter- mine conformance to Table II. 8 P
32、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-Z-81572 (AS) 4.5.7 Modulus of rupture - The samples selected in accordance with 4.3.2.3 shall be tested for modulus of rupture to determine conformance to 3.9 using the method detailed in ASTM C 369.
33、 The distance between supports shall not be less than 2 inches When testing rods with slotted configuration, random slot orientation shall be wed. In the calculation of modulus of rupture, the diameter of the specimen shall be calculated on the basis of a solid rod, neglecting corrections for center
34、 hole or rod slots if such configurations are used. 4.5.8 Bulk density - Samples of rods selected in accordance with 4.3.2.3 shall be tested for bulk density to determine conformance to 3.10. Each test specimen shall weigh from 2 to 25 grams. Test specimens shall be dried for 2 hours in an oven at 1
35、05 to 110“ C (221O to 230“ F) and then cooled in a desiccator to room temperature. Each specimen shall be weighed immediately to the nearest thousandth of a gram upon removal from the desiccator. The volume of the rod shall be calculated from actual rod dimensions, that is, solid shape value les$ an
36、y applicable hole or slot volume if such configuration is used. The bulk density of a specimen is the quotient of its dry weight in grams divided by the exterior volume in cubic centimeters. 4.5.9 Porosity - Samples selected in accordance with 4.3.2.3 shall be tested for total rod porosity to determ
37、ine conformance to 3.11 in accordance with ASTM D 116. The specimen used for bulk density (see 4.5.8) may be used for total porosity. 4.5.10 Grain size - Samples selected in accordance with 4.3.2.3 shall be tested for size of the grains in the rod to determine conformance to 3.12. A thin specimen of
38、 the rod material shall be sectioned and examined under a petro- graphic microscope. 4.6 Rejection and retests - 4.6.1 Rejection - When one or more test specimens fails to meet any of the tests reqiiired by this specification, the lot represented by the specimen or spec- imens SW be subjected to rej
39、ection, except as otherwise provided by MIL-STD-105. 4.6.2 Resubmitted lots - Paragraph 6.4 of MIL-STD-105 shall apply except that a resubmitted lot shall be inspected using tightened inspection. For visual ex- amination where the original acceptance number was zero, a sample size represented by the
40、 next highsr sample size code letter shall be chosen. 5. PREPARATION FOR DELIVERY 5. l Application - The requirements of Section 5 apply only to direct pur- chases by or direct shipments to the Government. 5.2 Packaging - Unless otherwise specified, the lime-stabilized zirconium oxide for flame spra
41、ying shall be packaged Level C to afford the minimum degree of 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. IL-Z-81572 68 m 7777906 0322868 3 m MILZ-81572 (AS) protection necessary to prevent deterioratiomor damage during shipment under normal
42、 environmental cnditions and commercial modes of transportation. 5.3 Packing - Unless otherwise specified, the lime-stabilized zirconium oxide for fiame spraying that requires overpacking by the carrier shall be packed Level C, in exterior type shipping containers in a manner that will insu?e safe t
43、ransportation at the lowest rate to the point of delivery, and shall meet as a minimum, the require- ments of the rules and regulations applicable to the mode of transportation selected. 5.4 Marking - In addition to any special marking required by the contract or purchase order (see 6.3, packages an
44、d shipping containers shall be marked in accordance with MILSTD-129. In addition, all containers shall be marked with the following information: (a) Stock number or other identification number as specified in the purchase document. (The supplier shall enter the Federal Stock Number specified in the
45、purchase document or as furnished by the procuring activity. When the Federal Stock Number is not provided or available from the procuring activity, leave space therefor and enter the Stock Number or other identification when provided by the procuring activity. ) (b) Zirconium Oxide, Lime-Stabilized
46、 for Flame Spraying Use (c) Specification MIL- Z- (d) Type - Powder or Rod (as applicable) (e) Grade - Sintered or Fused (as applicable) (f) Class of Powder (if applicable) (g) Manufacturers and suppliers name(s) ) Lot number (i) Date of manufacture U) Net weight 6. NOTES 6.1 Intended use - The lime
47、-stabilized zirconium oxide material is intended to be used with flame spraying processes to form a coating on the surfaces of a metai. The coating wiil act as a thermal and insulating barrier in order to pre- vent or delay contact between the metal and the atmosphere. The zirconia coated metal / 7
48、c- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-Z-81572 68 H 777770b 0122869 3 H MIL-Z-Bl572 (AS) is employed in heat exchapgers, rocket-motor nozzles, exhaust manifolds, jet engine parts, missieparts, etc. 6.1.1 Both grades of zirconium are s
49、tabilized by introducing another oxide (calcium) into the crystal lattice of the monoclinic type to change the structure to cubic. . 6.1.2 For flame spraying, either grade of the powdered zirconia may be used. The difference between the two grades depends upon the processing procedures employed by the supplier, which will only affect the chemical composition (see 3.2) and the particle hardness of the zirconia ma
