BS 1902-5 3-1990 Methods of testing refractory materials - Refractory and thermal properties - Determination of thermal expansion (horizontal method to 1100 C) (method 1902-503)《耐火.pdf
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1、BSI BS*1902: SEC%5.3 O1 W 1624669 0301742 b BS I902 : Section 5.3 : 1990 UDC 666.76.017 : 666.9.046 : 666.9.017 : 536.4131 : 620.1 British Standard Methods of testing. R ef r ac t ory rn at er a Is Part 5. Refractory and thermal properties Section 5.3 Determination of thermal expansion (horizontal m
2、ethod to 1 100C) (method 1902-503) Mthodes dessai des matriaux rfractaires Partie 5. Proprits rfractaires et proprits thermiques Section 5.4 Dtermination de la dilatation thermique (mthode horizontale jusqu 1100 O C) (Mthode 1902-503) Prfung feuerfester Werkstoffe Teil 5. Feuerfeste und thermische E
3、igenschaften Abschnitt 5. Bestimmung der Wrrnedehnung bei 1100 O C (Waagerecht-Verfahren; Nr. 1902-503) British Standards Institution _- .- t BSI BS*kL902: SEC*5.3 O3 3624bb9 0303743 8 = BS 1902 : Section 5.3 : 1990 Foreword This Section of BS 1902 : Part 5 has been prepared under the direction of t
4、he Refractory Products Standards Policy Committee. The method given in this Section supersedes those given in BS 1902 : Part IA : Section IO, which will be deleted by amendment. Compliance with a British Standard does not of itself confer immunity from legal obligations. 1 BSI BS*2902: SEC*.5.3 O2 m
5、 lb24669 0302744 T m I BS 1902 : Section 5.3 : 1990 Contents Foreword Committees responsible Method 1 Scope 2 Designation 3 Definition 4 Principle 5 Apparatus 6 Test pieces 7 Calibration 8 Procedure 9 Calculation and expression of results 10 Test report Appendix A Preferred construction of apparatus
6、 Table 1 Thermal expansion reference data for polycrystalline alumina, relative to 20 OC Page inside front cover Back cover Figures 1 Suitable system for automatic recording of 2 Assembly of test piece and measuring device 3 Preferred type of thermal expansion apparatus expansion and temperature 2 2
7、 2 2 2 2 3 4 4 5 6 3 3 4 7 1 iSI BS*1902: SEC*S-3 OL M 1624669 0301745 L m BS 1902 : Section 5.3 : 1990 Method NOTE. This Section is to be read in conjunction with BS 1902 : Section 5.0 Introduction and Section 3.1 Guidance on sampling Section 5.0 shows the general arrangement of BS 1902 and lists t
8、he Sections of Part 5, 1 Scope This Section of BS 1902 : Part 5 describes a method for determining the thermal expansion of refractory materials. It is applicable only to products which have been fired to a temperature equal to or greater than the upper limit of intended testing. The maximum tempera
9、ture for testing is 1100 OC. NOTE 1, The temperature is restricted because of the material recommended for the equipment and the absence of water cooling. NOTE 2. A method for testing at temperatures up to 1500 Oc is given in BS 1902 : Section 5.14. NOTE 3. The tith of the publlcations referred to i
10、n this standard are listed on the inside back cover. 2 Designation The method described in this Section is referred to by the . following designation: Method 1902-503 3 Definition For the purposes of this Section of ES 1902 : Part 5, the following definition applies: 3.1 thermal expansion. The propo
11、rtional extension which occurs when a material is heated. 4 Principle A test piece is heated at a specified, uniform rate and its change in length and temperature measured, either con- tinuously or at regular and frequent intervals during the heating. The thermal expansion, relative to ambient tempe
12、rature, is calculated for the temperature of the test piece and the results either plotted as a graph or expressed as a mean coefficient of expansion for a given temperature range. 5 Apparatus 5.1 General. The apparatus shall consist of a furnace and the three components given in 5.2 to 5.4, shall b
13、e of a size to accommodate the test piece (see 6.21, and shall be capable of being calibrated in accordance with clause 7. The preferred construction of the apparatus shall be as given in appendix A. The use of any other material for the construction shall be reported. _- -_ 5.2 Measuring device, fo
14、r measuring changes in the length of the test piece, which may be one of the following: (i) A dialgauge with jewelbearings, with a minimum range of 5 mm and a scale graduated to 0.002 mm. (i) A digital displacement indicator, with a minimum range of 5 mm, reading to an accuracy of 0.002 mm. (i) A li
15、near transducer, with a minimum range of 5 mm and linearity of 0.1 % or better, with a millivolt- meter of suitable range and linearity of 0.1 % or better. (iv) A linear transducer, for automatic recording, with a minimum range of 5 mm, linearity of 0.1 % or better, and an X-Y recorder which has lin
16、earity and repeat- ability better than 0.1 % of full-scale deflection and variable control of sensitivity on ranges. If a transducer is used (iii) or (iv), its sensitivity (mm/V) shall be checked using a micrometer each time the apparatus is calibrated (see clause 7). 5.3 Instrumentation, for contro
17、lling the furnace and measuring the temperature of the test piece via the thermo- couple (5.41, consisting of one of the following. (a) For a manual recording system, a ramp generator/ controller with PID (proportional, integral, derivative control), with digital temperature display, a range of at l
18、east 1200 OC and an accuracy of temperature measure- ment of f 0.3 % of full scale. (6) For an automatic recording system (see figure 1) a ramp generator/controller as specified in (a) with analogue signal output for connection to the X-Y recorder (item (iv) of 5.2). 5.4 Thermocouple, platinum- 13 %
19、 rhodium/platinum in accordance with BS 4937 : Part 2. The thermocouple is used as part of the furnace temperature control system and also as an indicator of the temperature of the test piece. 5.5 Vernier callipers, in accordance with BS 887. 5.6 Reference material, used to obtain the calibration da
20、ta to correct the measured change in length of a test piece (see clause 7). The correction to be applied is obtained by calibration using a test piece prepared, preferably, from polycrystalline alumina, which should contain at least 993 % alumina and have a minimum density of 3.70 g/cm3 I The therma
21、l expansion reference data are given in table 1. The use of any other reference material shall be reported, together with the reference data used. 2 A BSI BSx1702: SEC*5.3 O1 Zb2Ybb7 030174b 3 W BS 1902 : Section 5.3 : 1990 The end face in contact with the measuring device shall be ground to a radiu
22、s between 5 mm and 20 mm. If a piece of the specified length cannot be obtained, a shorter piece may be used, down to a minimum length of 60 mm, in which case the apparatus shall be calibrated (see clause 7) using a piece of reference material of the same length as the test piece. 7 Calibration 7.1
23、General It is necessary to correct the measured change in length of a test piece for: (a) the effect of differential expansion in the apparatus which acts in opposition to the measured change in length of the test piece; and (b) systematic errors arising from the design of the apparatus and its meth
24、od of use as described in clause 8. 7.2 Produre for calibration Calibration data to be used in tests to correct the measured changes in length of a test piece shall be obtained as Measure the change in length of a test piece of the reference material (5.61, of dimensions given in 6.2, using the proc
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