1、 - 7 MIL-V-48773 (2) 68 M 7779906 012L278 W MIL-V-48773 (AR) AMENDMENT 2 15 March 1985 SUPERSEDING AMENDMENT 1 25 September 1978 MILITARY SPECIFICATION VANADIUM PENTOXIDE (FOR USE IN AMMUNITION) This amendment forms a part of Military Specification MIL-V-48773, dated 19 June 1975, and is approved f
2、or use by the US Army Armament, Munitions and Chemical Command, and is available for use bv all Departments and Agencies of the Department of Defense. PAGE 1 Delete the preamble and substitute the following: “This specification is approved for use by the US Army Armament Munitions and Chemical Comma
3、nd and is available for use bv all Departments and Agencies of the Department of Defense.“ PAGE 2 1.3 Chemical Properties. Delete table in its entirety and substitute the followinq table: 3 FSC: 6810 1 of 5 , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
4、HS-,-,-MIL-V-48773 (2) b W 777770b 0323277 T MIL-V-48773 (AR) Amendment 2 “Table I: Chemical Properties Property Re qu i r ement Moisture Content, %, max 0.40 Vanadium (as V2O5, % min (on Moisture Free Basis) 99.50 Halogens (as C1, Br, I), %, max 0.007 Iron, (as Fe2O3), %, max. 0.015 Sodium (as Na2O
5、), %, max. 0.025 Resistivity - ohm-cm 4000 lbs. 7,500 Appl i cab le Par ag caph 4,4.3.3 4.4.3.4 4.4.3.5 4.4.3.6 4.4.3.7 4 4 .3 . 1 O I 3.1.4 Particle size. Delete in its entirety. PAGE 4 4.4.2.1 Samplinq. Add the following to the end of the second “or the samples from each batch that is combined int
6、o a shipping lot shall be subjected to the tests listed below in accordance with MIL-STD-105, Level II .I1 sentence: i %- Delete the table and substitute the following table: “Table II - Classification of Defects I nspec tion/liequ i rement Form fsee 3.1. I.) X-ray Diffraction (see 3.1.2) . Properti
7、es (see 3.l.3) Mo is tu re Vanadium (as V2O5) Halogens (as C1, Br, I) Iron (as Fe2O3) Sodium (as Na20) Res i stiv i ty Defect Classification Major Major Major 4.4.3.1 Form. In the first sentence delete “ 1./2 pound“ and substitute “100 9. II Provided by IHSNot for ResaleNo reproduction or networking
8、 permitted without license from IHS-,-,-MIL-V-48773 (2) 68 m 7979906 L2L280 b MIL-V-48773 (AR) Amendment 2 PAGE 6 4.4.3.5 Chlorides. Delete this paragraph in its entirety and substitute the following: “4.4.3.5 Halogens (as CI, Br, I) - Determine the halogens present in the compound by use of a stand
9、ard analytical technique for halogens which has prior approval (see 6.5)“. PAGE 7 4.4.3.7 Sodium. To end of paragraph add the following sentence: “The method used shall have prior approval (see 6.5“). 4.4.3.8 Silica. Delete this paragraph in its entirety. 4.4.3.9 Particle Size. Delete this paragraph
10、 in its entirety. 4.4.3.10 Add a new paragraph and number it 4.4.3.10. “4.4.3.10 Resistivity 4.4.3.10.1 Equipment. a. Laboratory Press - force indicated for 1500, 2000, 3000 and 4000 pounds. b. Height fixture. c. Test Cylinder & Pistons d. Ke-ithley 602 Electrometer e. 5K Ohm and 10K Ohm Resistors f
11、 Laboratory Balance Assemble height fixture and set up on laboratory press. Assemble Test Cylinder & Pistons and place between plates of height fixture. Connect Electrometer leads and close press until zero ohms is indicated (pistons are in contact). DIAL INDICATOR SHOULD READ 0.500. ADJUST FOR THI
12、S READING. Periodically check electrometer by measuring the 5K ohm and 10K ohm resistors. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-48773 (2) 68 4777706 OLZL28L MIL-V-48773 (AR) Amendment 2 4.4-3.10.2 .Procedure. -I- The cylinder and bo
13、ttom piston shal be assembled. the cylinder (Be sure there Is an even layer of V205 in the cylinder). and placed into the pres-s. -The electrometer leads shal be connected to the top and bottm pistons. -A pressure of 1500 pounds shall be applied. Record resistance (ohnis) and dial indicator reading.
14、 -A pressure of 2000, 3000 and 4000 pounds shall be repeated and recorded. -The pressure shall be released. Remove the cylinder, pistons and V2O5 pellet, Repat the above s necessary. One gram of V205 shall be poured into The tp piston shall be inserted into the cylinder 4.4.3.10.3 Calculations. - Th
15、e piston diameter (“0.500“) cacuates to k. 2668cm a2 area. b. Subtract Dial Indicator readings from 0.500. Convert c. Use the following formula: the results to centimeters by multiplying by 2.54. 1.2668R - - AR Resistivity - L L where : A =-Area of piston of test fixture R = Resistance (ohm-) L =Thi
16、ckness of -sample (cri) and Resistivity = (ohm cm) .I PAGE 8 96 6.3 Add the following source to the end f the-fifst sentence: “and Metallurg Inc., 25 East 39th St., New York, NY 10016.“ 6.5 Add the following new paragraph: “6.5 The method used to determine the requirement should be submitted to AMCM
17、C-QAR-R through the contracting officer for prior approval“ . . The margins of this amendment are marked with an asterisk or ver ti cal li nec to i ni cat e where changes (addi ti ons , modifications, corrections, delections) from the previous 4 Provided by IHSNot for ResaleNo reproduction or networ
18、king permitted without license from IHS-,-,-MIL-77-48773 (AR) Amendment 2 amenilment were made. This was done as a oonvenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements f this document based on the entire content irrespective of the marginal notations and relationship to the 1 ast previous amendment. Cus todi an: Amy - AR Preparing Activity Army - AR Proj ect (681 04344) 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
