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1、STD-JIS R 7222-ENGL 1997 I 4933b08 0548585 953 M J IS JIS R 722211997 JAPAN ES E INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Test methods for physical properties of graphite materials * ICs 25.180.10 Descriptors : graphite, purity, physical testing Reference number
2、 : JIS R 7222 : 1997 (E) 7s R 7222 : 1997 This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization L
3、aw: Date of Establishment: 1962-09-01 Date of Revision: 1997-04-20 Date of Public Notice in Official Gazette: 1997-04-21 Investigated by: Japanese Industrial Standards Committee Divisional Council on Ceramics Technical Committee on Carbon Graphite Products JIS R 7222 : 1997, First English edition pu
4、blished in 1998-01 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. , O JCA 1998 All rights reserved. Unless otherwise specified, no part
5、 of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan ST3-JIS R 7222-ENGL 1997 D 4933b08 0548587 72b m JAPANESE INDUSTRIAL STANDARD JIS R 7222
6、: 1997 Test methods for physical properties of graphite materials 1 properties of graphite materials (hereafter referred to as “materials“). Scope Remarks: The normative references to this Standard are as follows: JIS B 7502 Micrometer callipers JIS B 7507 Vernier, dial and digital callipers JIS B 7
7、512 Steel tape measures JIS B 7516 Metal rules JIS B 7721 Tensile testing machines JIS B 7733 Compression testing machines JIS K 8810 1-Butanol JIS Z 8401 JIS Z 8801 Test sieves This Japanese Industrial Standard specifies test methods for physical Rules for rounding off of numerical values 2 are as
8、follows: Test items Items for measuring physical properties specified in this Standard (1) True specific gravity (2) Bulk specific gravity (3) Bending strength (4) Compressive strength (5) Tensile strength (6) Youngs modulus (7) Resistivity 3 Common apparatus 3 . 1 1/2 O00 of weighing capacity for a
9、 weighing capacity of 1 kg or over, and at most 1/20 O00 of weighing capacity for a weighing capacity less than 1 kg. Balance The reciprocal sensibility of a balance to be used shall be at most , 3 . 2 For the measurement of a size in the range O mm to 50 mm, a micrometer with 0.01 mm minimum scale
10、specified in JIS B 7502 shall be, as a rule, used. For the measurement of a size in the range 50 mm to 1 O00 mm, vernier calliper with 0.05 mm minimum scale specified in JIS B 7507 shall be, as a rule, used. For the measurement of a size in the range 1 O00 mm to 3 O00 mm, a steel tape measure with 1
11、 mm minimum scale specified in JIS B 7512 or a metal rule with 1 mm minimum scale specified in JIS B 7516 shall be used. Length meter -,-,- STD*JIS R 7222-ENGL 1997 Li933b08 0548588 bb2 = Test item 2 R 7222 : 1997 Position, direction, and quantity of sampling Shape and size 3.3 Thermometer The mercu
12、ry in glass thermometer having a range of O “C to 150 “C shall be used. However, for the thermometer used for measurement of true specific gravity, that of M O O “C in precision shall be used. 3.4 Dryer An electric thermostat with automatic temperature regulator capable of keeping the temperature at
13、 105 “C to 110 “C shall be used. 4 numerical values of test results shall be as specified in JIS Z 8401. Rounding off of numerical values of test results Rounding off of the 5 of sample shall be as given in Table 1. Sample The sampling method, shapes and sizes of test pieces, and preparation Table 1
14、 Sampling method, shapes and sizes of test pieces, and preparation of sample Bending strength Youngs modulus Resistivity Tensile strength Compressive strength A test piece shall be taken from a part of specimen material by aligning the longitudinal direction of the test piece to the longitudinal dir
15、ection of specimen material and avoiding the peripheral part. The number of test pieces shall be two pieces per each test item. A round bar of 20 mm diameter and 100 mm length or a square bar of 20 mm width, 20 mm thickness, and 100 mm length. As given in Fig. 1. 30 mm length True specific gravity A
16、s a rule, all amount of test pieces subjected to the bending strength test shall be crushed, sufficiently mixed, reduced to about 30 g and ground in an agate mortar until all amount passes through standard wire sieve of 150 pm specified in JIS Z 8801, and then used for the sample of true specific gr
17、avity test. The test pieces not yet subjected to the bending strength test shall be Bulk specific Remarks 1 Measurements of the bulk specific gravity, Youngs modulus, and resistivity of artificial graphite round electrode shall, as a rule, be carried out on the electrode main body. 2 When the sample
18、 of the dimensions given in the above table can not be taken according to the size, grain size, etc. of raw material, the shape and dimensions of a test piece can be varied. In this case, the shape and dimensions of the test piece shall be clearly stated on the test report. 3 R 7222 : 1997 Unit: mm
19、A / Y TW40. 3.5 screw thread 7 Fig. 1 Shape and dimensions of test piece for tensile strength 6 specific gravity shall be as follows: Measuring method for true specific gravity The measuring method for true (1) Sample Samples shall be taken as described in 5. (2) Operation Accurately measure the mas
20、s of the pycnometer with side tube of about 40 ml in inner volume (refer to Fig. 2) preliminarily dried sufficiently. Then, place the sample (which is dried in an air bath at 105 “C to 110 “C for about 2 h and cooled to room temperature in a desiccator) flatly onto the bottom so as to be of a thickn
21、ess of about 10 mm (7 g to 12 g), and then accurately weigh its mass. Quietly add guaranteed grade of 1-butanol solution specified in JIS K 8810 preliminarily kept at a reduced pressure of 2.0 kPa to 2.7 kPa for 20 min or over thereto and to a depth of about 20 mm. Then, confirm no generation of lar
22、ge bubble by slightly vibrating the pycnometer, put it into a vacuum desiccator and gradually exhaust it to a pressure of 2.0 kPa to 2.7 kPa. Keep it at that pressure for 20 min or over. After the generation of bubble stops, take it out, further, fill it with 1-butanol, stopper it, dip it into a the
23、rmostatic bath (regulated at 30 “C+0.13 “Cl for 15 min or over and align the liquid surface of 1-butanol with the marked line. Then, take it out, sufficiently wipe its outside and cool it to room temperature. Thereafter, accurately weigh its mass, further, put it into the thermostatic bath again, re
24、peat the same operation and take the mean value of 4 results of such operations. Then, fill the same pycnometer with only 1-butanol, dip it into the thermostatic bath in the same way as above-mentioned and align the level with the marked line. Thereafter, weigh the mass, further repeat the operation
25、 and take the mean value of 4 results of such operations. Take the distilled water from, which dissolved gas is removed just before use by boiling, into the pycnometer, dip it into the thermostatic bath in the same way as above-mentioned and align the level with the marked line. Weigh its mass, furt
26、her repeat the operation and take the mean value of 4 results of such operations. -,-,- 4 R 7222 : 1997 Unit: mm Inside diameter w I- About 50 4 Remarks 1 The pycnometer with side tube shall be about 40 g in mass and about 40 ml in capacity up to the marked line and its wall thickness should prefera
27、bly be as tin as possible. 2 The ground joint of the cover attached to the body shall be airtight. Fig. 2 Pycnometers (3) Calculation The true specific gravity of sample shall be calculated according to the following formula and rounded off to three places of decimals. where, dt : true specific grav
28、ity m1 : mass of pycnometer (g) m2 : mass of pycnometer containing sample (g) m3 : mass of pycnometer containing only 1-butanol up to the marked line (g) m4 : mass of pycnometer in which a sample is put in and further 1-butanol is put in up to the marked line (g) m5 : mass of pycnometer in which onl
29、y distilled water is put in to the marked line (g) d : specific gravity of water (0.994 6, 30 “Cl (4) Report The true specific gravity of a sample shall be expressed by rounding off the mean value of 3 measured values obtained in 6 (2) abovementioned to two places of decimals. -,-,- STD-JIS R 7222-E
30、NGL 1797 E 4733b08 0548573 157 5 R 7222 : 1997 7 be measured as follows: Measuring method for bulk specific gravity The bulk specific gravity shall Test piece Test pieces shall be sampled in accordance with 5. Operation Keep a test piece in an air bath at 105 “C to 110 O C for 2 h and gradually cool
31、 it in a desiccator to room temperature. Immediately weigh its mass, transfer it into the air bath again and weigh its mass by cooling it at each hour. Repeat this operation until it reaches a constant weight. Then, measure the length of each side of test piece (in the case of round bar, length and
32、diameter) at 4 positions and obtain its volume from the mean sizes of each side. Calculation The bulk specific gravity of a test piece shall be calculated according to the following formula and rounded off to three places of decimals. m db= - U where, dh : bulk specific gravity m : mass of dry test
33、piece (g) u : volume (cm3) Report The bulk specific gravity of a test piece shall be expressed by rounding off the mean of measured values on two pieces to two places of decimals. Measuring method for bending strength Bending strength shall be measured as follows: Test piece Test pieces shall be sam
34、pled in accordance with 5. Apparatus For the testing machine, the bending testing machine specified in JIS B 7733 shall be used. In this case, the distance between its fulcrums shall be 80 mm, the radius of curvature of fulcrum edge shall be 1.5 mm, the angle of pressurizing wedge shall be 60 and th
35、e radius of curvature of its tip shall be 3 mm. Operation Horizontally place the test piece on the support stand, vertically add a load onto the center of the test piece at a uniform loading rate selected from a range of 40 N to 60 N per second, and read the maximum load, when the test piece is brok
36、en, on the scale plate. Calculation The bending strength of the test piece shall be calculated accord- ing to the following formula and rounded off to one place of decimal. (a) In the case of round bar (b) In the case of square bar -,-,- 6 R 7222 : 1997 where, Sb : bending strength (N/cm2) I : dista
37、nce between fulcrums (cm) W : maximum load (N) d : diameter of test piece (cm) b : width of test piece (cm) t : thickness of test piece (cm) (5) Report The bending strength shall be expressed by rounding off the mean of measured values on two test pieces to integer. The loading speed shall be clearl
38、y stated. 9 Measuring method for compressive strength The measurement of compressive strength shall be carried out as follows: (i) Test piece (2) Apparatus (3) Operation Test pieces shall be sampled in accordance with 5. For the testing machine the compression testing machine specified Select the su
39、rface of 30 mm in diameter on the test piece as the pressurizing surface, take care about uniform pressing, by contacting a thick paper piece or the like to the pressurizing surface if necessary, press the point at a uniform loading rate selected from a range of 40 N to 60 N per second, and read the
40、 maximum load, when the test piece is broken, on the scale plate. The compressive strength of test piece shall be calculated according to the following formula and rounded off to one place of decimal. in JIS B 7733 shall be used. (4) Calculation W s,= - S where, S, : compressive strength (N/cm2) W :
41、 maximum load (N) S : area of pressurizing surface of test piece (cm2) (5) Report The compressive strength shall be expressed by rounding off the mean of measured values on two test pieces to integer. 10 Measuring method for tensile strength The measurement of tensile strength shall be carried out a
42、s follows: (i) Test piece (2) Apparatus (3) Operation Test pieces shall be sampled in accordance with 5. For the testing machine, the tensile testing machine specified in Grip both ends of the test piece with tensile metal fittings, add a tensile load at a uniform bending rate selected from a range
43、of 20 N to 40 N per second, and read the maximum load, when the test piece is broken at the parallel part as given in Fig. 1 on the scale plate. JIS B 7721 shall be used. -,-,- STD-JIS R 7222-ENLL L997 4933b08 0548593 T2T Amplifier 7 R 7222 : 1997 Speaker (4) Calculation The tensile strength of test
44、 piece shall be calculated according to the following formula and rounded off to one place of decimal. W s,= - S where, S, : tensile strength (N/cm2) W : maximum load (N) S : area of central section of test piece (cm2) (5) Report The tensile strength of test piece shall be expressed by rounding off
45、the mean of measured values on two test pieces to integer. 1 1 Measuring method for Youngs modulus The measurement of Youngs modulus shall be carried out as follows: (i) Test piece (2) Apparatus Test pieces shall be sampled in accordance with 5. The apparatus as given in Fig. 3 shall be used. Specim
46、en t Indicator Pickup 1 Fig. 3 Measuring apparatus for Youngs modulus (3) Operation Place the specimen on a support stand so that its both ends can freely longitudinally be vibrated and add the driving force perpendicularly to the end surface of specimen. Place the pickup in contact with the specime
47、n so as to be operated in the vibrating direction of specimen. The frequency of oscillator is changed and observe the amplified output voltage of pickup while adding the driving force so that the specimen vibrates following thereto. When the primary resonance longitudinal vibration is confirmed from
48、 such phenomena that the clear maximum deflection appears on the indicator and further the node of vibration is measured, take the frequency in that case as the primary resonant frequency of longitudinal vibration. Youngs modulus shall be calculated according to the following formula, and rounded of
49、f to the second place of integer. (4) Calculation 41 Wfi2 ss E= where, E : Youngs modulus (N/mm2) I : length of specimen (mm) W : mass of specimen (NI -,-,- 8 R 7222 : 1997 fi: primary resonant frequency of longitudinal vibration (Hd g : acceleration of gravity (9 807 mm/s2) S : sectional area of specimen (mm2) (5) Report The Youngs mod