1、A-A-5 6025 W 9999974 OL2L57b TO7 W A-A-5 6 025 20 January 1993 COMMERCIAL ITEM DESCRIPTION PASTE, CONDUCTIVE The General Services Administration has authorized the use of this Commercial Item Description. Abstract. This commercial item description covers three types of conductive coatings or paste u
2、sed as a thick film screen printable conductor. Salient characteristics. The material described herein shall meet the requirements shown in table I, and shall satisfy a storage stability requirement of not less than six months when stored in the original, unopened container at 20 to 25 Celsius (Cl.
3、The material is a mixed bonded, high conductivity gold cermet material, in the form of a thixotropic paste, for use on alumina. It shall exhibit excellent adhesion. The material is designed to be printed with a stencil and shall not be used with a wire mesh screen. Workmanship of the material shall
4、be such as to ensure a homogeneous compound free of foreign materials. maintain substantiating evidence that the product offered meets the salient characteristics of this Commercial Item Description, and that the product conforms to the producers own drawings, specifications, standards, and quality
5、assurance practices. The government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract. Contractor certification. The contractor shall certify and Beneficial comments, recommendations, a
6、dditions, deletions, clarifications, etc. and any data which may improve this document should be sent to: Commander, U.S. Army Missile Command, ATTN: AMSMI-RD-SE-TD-ST, Redstone Arsenal, AL 35898-5270. AMSC N/A FSC 8030 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
7、. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ti w E-c A-A-56025 rn 9999974 0121577 943 rn A-A-5 60 2 5 k 3 VI X d al En! O o* om mo3 O0 cici O0 Ir) NW “m lu E E I2 I -4 IX 00 YI hci 34-4 4 -4 n-2 . Wk ao -4 Oh a al OE Cu) 7 E II4 I IIX I ll(d I
8、IIE I O (? io lu r) O 4J io lu In CD 00 O 4J In I b) E 2 -4 C -4 E u) t-4 a, k (d u) 5 - k ox -4 td .ci au) C -ri k kO tn E: .Y (d a, h c, u) LI O c -4 O n X (d a, k t: -2 k O LI d al f u) C O 4J 3 a, cc h .ckc c ho o o wo 4-40 0 k L) 2 Provided by IHSNot for ResaleNo reproduction or networking perm
9、itted without license from IHS-,-,-A-A-56025 D 9999974 0323578 88T H A-A-5 6025 Metric products. Products manufactured to metric dimensions inch-pound units, provided they fall within specified tolerances using conversion tables contained in the latest revision of FED- STD-376, and all other require
10、ments of this Commercial Item Description are met. If a product is manufactured to metric dimensions and those dimensions exceed the tolerances specified in the inch/pound units, a request should be made to the contracting officer to determine if the product is acceptable. The contracting officer ha
11、s the option of accepting or rejecting the product. 0 will be considered on an equal basis with those manufactured using Regulatory requirements. The offeror/contractor is encouraged to use recovered materials IAW Public Law 94-580 to the maximum extent practical. Preservation, packaging, packing, l
12、abeling, and marking. The preservation, packaging, packing, labeling, and marking shall be as Specified in the contractor or order. CID-based part identification number. The following part identification number procedure is for government purposes and does not constitute a requirement for the contra
13、ctor. A xxxxx Example of part identification number A-XXXXX Type # CID number I I Designates a CID NOTES : A. Types. The purchaser should specify the type material desired in the contract or purchase order. The conductive paste shall be of the following types, based on resistivity and viscosity: Typ
14、e 1 Type II Type III - Low electrical resistivity, high viscosity. - Low electrical resistivity, low viscosity - High electrical resistivity, low viscosity 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-56025 E 9999974 0121579 7Lb A-A- 5 6025
15、. B. Test methods. 1. Visual examination and inspection. The item or material shall be visually examined without magnification. 2. Storage stability. A sample quantity of the material in an original, unopened package shall be stored under the conditions specified. At the end of the storage period, t
16、he material shall meet all requirements specified. The suppliers certifications of compliance to the storage stability requirements may be accepted during the storage period. 3. Viscosity. a. Type I. This method covers the measurement of the apparent viscosity of a shear-rate dependent material in s
17、mall quantities. (1) Apparatus. A Brookfield Model HB viscometer with Small Sample Adapter SC4-14/6 (Utility Cup and Spindle), or equivalent, shall be used. A precision temperature measuring device, capable of measuring to the nearest O.ZC, shall be used. (2) Conditioning. The material shall not be
18、tested until 24 hours or longer have elapsed after completion of manufacturing. Condition the Small Sample Adapter to a temperature of 24.8 to 25.2C in a water bath. Load the sample cup with well mixed material. Slowly immerse the spindle into the material and ensure that no air is trapped under or
19、around it. Attach the spindle to the viscometer and adjust material level to the top of the cup. Allow five to ten minutes for the material to reach a constant temperature. (3) Procedure. Set the speed control to 10 revolutions per minute (RPM). the viscometer reading at the sixth revolution of the
20、spindle. Calculate the viscosity in Pascal seconds by multiplying the scale reading by the viscometer calibration factor. Start the motor of the viscometer and observe b. Type II and III. This method covers the measurement of the apparent viscosity of a shear-rate dependent material. (1) Apparatus.
21、A Brookfield viscometer, Model RVT with spindle ABZ, or equivalent, shall be used. A precision temperature measuring device, capable of measuring to the nearest 0.loC, shall be used. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. A-A-56025 99999
22、74 0323580 438 , A-A-5 6025 (2) Conditioning. Stir material slowly for at least 2 minutes. Condition the material to a temperature between 25.0 and 26.OoC. viscometer until the middle of spindle indent mark is immersed. Place the material under the vis&ometer and lower the (3) Procedure. Start the m
23、otor, set the speed control to 1 RPM, run for one minute and observe the viscometer reading. Then, start the motor, set the speed control to 10 RPM, run for 60 to 70 seconds and observe the viscometer reading. Calculate the viscosity in Pascal seconds by multiplying the scale reading at 10 EWM by th
24、e viscometer calibration factor. 4. Solids. a. Type I. Weigh a crucible to the nearest 0.1 milligram (Wl). Thoroughly mix material and add 1.5 to 2.0 grams to the crucible. Weigh to the nearest 0.1 milligram (W2). Ignite at not less than 75OoC in a box furnace for at least 20 minutes. Remove crucibl
25、e, cool and weigh to the nearest 0.1 milligram (W3). Calculate solids as follows: % Solids = W +-Y loo b. Type II and III. Weigh an alumina substrate to the nearest 0.1 milligram (Wl). Thoroughly stir material and spread 0.03 to 0.10 gram on the substrate. Weigh to the nearest 0.1 milligram (W2). Dr
26、y at 48.8 to 54.4OC for at least 15 minutes. Fire at 845 to 855OC for at least 10 minutes. Cool and weigh to the nearest 0.1 milligram (W3). Calculate solids. 5. Fineness of grind. a. Type I. Measure fineness of grind in accordance with ASTM D 1210 and the following exceptions: 1) Gage path may exce
27、ed 12.5 centimeters length. 2) Gage path may be 2.5 centimeters wide. 3) Gage path may be 25 microns to zero depth. 4) Scraper length shall exceed groove width(s). 5) Draw the material down and, within 10 seconds, observe and record the point where the fourth continuous scratch is initiated in the m
28、aterial. observe and record the point where 50% of the material in the path width is scratched away. 6) Draw the material down and, within 10 seconds, 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-56025 W 9999974 OL2L5BL 37q W t A-A-5 60 2 5
29、e b. Type II and III. Thin Type III material with 1% to 3% of a liquid recommended by the supplier. Measure fineness of grind in accordance with ASTM D 1210 and the following exceptions: 1) Gage path may be 25 microns to zero depth. 2) Scraper length shall exceed groove width(s). 3) Draw the materia
30、l down, observe and record the point where the first continuous steak is initiated in the material. 4) Draw the material down, observe and record the point where the streaks appear to join together. 6. Test specimen preparation. a. Type I. (i) Screen printing. Screen print the material on a not less
31、 than 96% alumina substrate in accordance with the following parameters: a.) Pattern: Any configuration of b.) Screen mesh: 325 c.) Emulsion thickness: 0.7 to 1.0 mils d.) Wet print thickness: 32 to 44 microns Table II (2) Drying. Dry the specimen in a vented oven at 145 to 155OC for not less than 1
32、5 minutes. (3) Firing. Fire the specimen in a belt furnace at a peak temperature of 850 to 86OOC for 8 to 12 minutes. The fired print thickness shall be 9 to 13 microns. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-56025 m 9999974 0323582 20
33、0 m A-A-5 602 5 TABLE II. Pattern features. 1. Trace: Not less than 160 squares 2. Pads: Not less than 2 millimeters square, not less than 4 pads 3. Lines: Not less than 3, 5 mil width, 5 mil separation b. Type II. (1) Screen printing. Screen print the material on a not less than 96% alumina substra
34、te in accordance with the following parameters: a.) Pattern: Any configuration of trace b.) Screen mesh: 325 c.) Emulsion thickness: 12 to 50 microns. and pads per Table II (2) Drying. Dry the specimen in a vented drying oven at 120 to 130C for 10 to 15 minutes. (3) Firing. Fire the specimen in a be
35、lt furnace at a temperature ascent/descent rate of 60 to 100C per minute and a peak temperature of 845“ to 855C for 10 to 12 minutes. print thickness shall be 15 to 25 microns. The fired c. Type III. (1) Screen printing. Thin the material with 1% to 3% of Screen print the material on a liquid recomm
36、ended by the supplier. a not less than 96% alumina substrate in accordance with the following parameters: a.) Pattern: Any configuration of trace b. ) Screen mesh: 325 c.) Emulsion thickness: 12 to 50 microns. and pads per Table II (2) Drying. Dry the specimen in a vented oven at 120 to 130C for 10
37、to 15 minutes. (3) Firinq. Fire the specimen in a belt furnace at a temperature ascent/descent rate of 60 to 100C per minute and a 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-56025 = 9%99974 01215153 147 D A-A- 5 6025 peak temper ture of 84
38、5 to 855C for 10 ,o print thickness shall be 10 to 15 microns. 2 minutes. The fired 7. Printability. a. Type I. Prepare test specimen in accordance with paragraph 6.a. Examine features for legibility at a distance of not less than six inches with available room lighting and either without the aid of
39、 magnification or with a viewer having a magnification no greater than 3x. Legibility consists of: 1.) Features not missing in whole or in part 2.) Features not faded, smeared, blurred or shifted (dislodged) to the extent that they cannot be readily identified 3.) The 5 mil width lines are not great
40、er than 6.5 mils in width. b. Type II and III. Prepare test specimen in accordance with paragraph 6.b. for Type II and paragraph 6.c. for Type III. Examine features for legibility at a distance of not less than six inches with available room lighting and either without the aid of magnification or wi
41、th a viewer having a magnification no greater than 3x. Legibility consists of: 1.) 2.) Features not faded, smeared, blurred or shifted Features not missing in whole or in part (dislodged) to the extent that they cannot be readily identified. 8. Resistivity. Prepare test specimen in accordance with p
42、aragraphs 6.a., 6.b. or 6.c., as applicable. Measure resistance between trace ends on test specimen using a 4 wire Kelvin bridge, or equivalent. Measure fired material thickness substrate using a calibrated microscope or equivalent. resistivity using the following formula: Calculate Resistivity = 10
43、00R x T S Normalized T Where : R is resistance in ohms S is number of squares in printed pattern T is actual thickness in microns Normalized T is artificial thickness used for reporting resistivity 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,
44、.“ A-A-56025 9999974 0121584 083 W A-A-5 6 025 9. Adherence. Prepare test specimen in accordance with paragraph 6.a. for Type I and paragraph 6.c. for Type III, Solder # 20 AWG tinned copper wire to pads and allow to stabilize at 18.5 to 26.6OC for not less than 16 hours. Bend wire to a right angle
45、with the substrate surface at a distance of 0.112 to 0.125 centimeters (cm) from the pad leading edge. Mount the specimen in a test machine and apply tension to the vertical wire at a cross head speed setting of 0.125 cm per minute until separation occurs between the pad and substrate. Test not less
46、 than ten specimens. Calculate average breaking strength. C. Material safety data sheets. Material safety data sheets are required by Title 29 Code of Federal Regulations, Section 1910.1200, and shall be prepared in accordance with the requirements of FED-STD-313. Contracting officers will identify
47、those activities requiring copies of completed material safety data sheets prepared in accordance with FED-STD-313. The pertinent Government mailing addresses for submission of data are listed in FED-STD-313. D. Source for reference documents. Copies of referenced federal and military specifications
48、 and standards may be obtained by sending a request for copies to the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Ave., Philadelphia, PA 19111- 5094: FED-STD-313 FED-STD-376 - Material Safety Data, Transportation Data and Disposal Data for Hazardous Materials Furnished to Government
49、Activities - Preferred Metric Units for General Use by the Federal Government Copies of ASTM D 1 LO, “Standard Test Method for Fineness of Dispersion of Pigment-Vehicle Systems,“ are available from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187. E. Acceptable products and part numbers. The products described in this commercial item description are avai
