BS 1902-4 6-1985 Methods of testing refractory materials - Properties measured under an applied stress - Determination of resistance to abrasion at ambient temperature (abradabilit.pdf
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1、BRITISH STANDARD BS1902-4.6: 1985 Methods of testing Refractory materials Part 4: Properties measured under an applied stress Section 4.6 Determination of resistance to abrasion at ambient temperature (abradability index at ambient temperature) (method1902-406) UDC666.76.017:620.178.162BS1902-4.6:19
2、85 This British Standard, having been prepared under the directionof the Refractory Products Standards Committee, was published under the authorityof the Board of BSI andcomes into effect on 28February1985 BSI03-1999 The following BSI references relate to the work on this standard: Committee referen
3、ce RPM/1 Draft for comment83/77597DC ISBN 0 580 14305 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Refractory Products Standards Committee (RPM/-) to Technical Committee RPM/1, upon which the following bodies were represented: Briti
4、sh Ceramic Research Association British Steel Industry Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Institute of Refractories Engineers Refractories Association of Great Britain Refractory Contractors Association Society of Glass Technology A
5、mendments issued since publication Amd. No. Date of issue CommentsBS 1902-4.6:1985 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Designation 1 3 Definition 1 4 Principle 1 5 Apparatus 1 6 Assembly of abrasion apparatus 1 7 Correction factor C and calib
6、ration of abrasion apparatus 2 8 Preparation of test pieces 2 9 Test procedure (abradability index) 2 10 Sieving and replacement of abrasive 3 11 Calculation of abradability index 3 12 Test report 3 Figure 1 Assembly of abradability apparatus 4 Figure 2 Details of abradability apparatus 5 Publicatio
7、ns referred to Inside back coverBS1902-4.6:1985 ii BSI 03-1999 Foreword This Section of BS1902-4 has been prepared under the direction of the Refractory Products Standards Committee. It supersedes Appendix C of BS1902-1A:1966 which is to be deleted by amendment. The method of test described in this
8、Section measures the same property of the material under test as that described in BS1902-4.7 but at ambient or room temperature instead of at an elevated temperature of up to1400C. The method is based on the Morgan-Marshall tests 1) . A British Standard does not purport to include all the necessary
9、 provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to6
10、, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover. 1) F. H. Aldred, A. Elliott and K. W. Cowling. Brit. Ceram. Soc., 1955, 54, 239.BS 1902-4.6:1
11、985 BSI 03-1999 1 NOTEThis Section is to be read in conjunction with BS1902-4.0 2)“Introduction” and BS1902-3.1 “Guidance on sampling”. Section4.0 sets out the general arrangement of BS1902 and lists the Sections of Part4. 1 Scope This Section of BS1902-4 describes a method for determining the resis
12、tance to abrasion (abradability index) of bricks or blocks of refractory materials at ambient temperature. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Designation The method of determination of resistance to abrasion described in this Sectio
13、n is referred to by the following designation: Method1902-406. 3 Definition For the purposes of this Section of BS1902 the following definition applies. abradability index an index which represents100times the volume in centimetres cubed of material abraded from a test piece which has been subjected
14、 to bombardment by brown fused alumina grain for a specified time under specified conditions 4 Principle The loss in mass of a dried test piece is measured when it is subjected to the abrasive action of a specific quantity of calibrated brown fused alumina grain. The abradability index of the test p
15、iece in terms of volume loss is obtained by calculation using the measured loss in mass, a calibration correction derived from the standardization of the abrasion apparatus and alumina grain, the bulk density of the test piece and a multiplication factor of100. 5 Apparatus 5.1 Abrasion apparatus, as
16、 in Figure 1 and Figure 2 and consisting of an electric blower with variable transformer control, a calibrated venturi in which the abrasive grain is entrained in an air stream, a manometer, an abrasion chamber incorporating a test piece holder and an exhaust system to recover the abrasive grain. Th
17、e electric blower shall be capable of maintaining a pressure differential of at least250mm water pressure between the venturi and abrasion chamber when abrasive is running through the apparatus. The manometer, calibrated to measure a pressure differential of250mm water pressure, shall be connected t
18、o a tapping point at the air inlet to the venturi and another point located at the top of the abrasion chamber. The test piece holder and a suitable exhaust system shall be anchored to the chamber cover and shall incorporate means of adjusting the position of the test piece as described in clause6.
19、5.2 A balance, with an accuracy of 0.01g. 5.3 Scales, suitable for weighing6.35kg of alumina grain to an accuracy of 0.01kg. 5.4 Drying oven, with control for drying at110C. 5.5 Stop watch. 5.6 Brown fused alumina grain, angular grain of between1.7mm and7104m size grading. 5.7 Calibrated carbon bloc
20、ks, of specified loss in mass when subjected to abrasion under specified test conditions. NOTESuitable carbon blocks (5.7), a calibrated venturi (5.1) and engineering drawings for the abrasion apparatus are available from the British Ceramic Research Association Ltd, Penkhull, Stoke-on-Trent. 5.8 Te
21、st sieves, of nominal aperture size1.7mm and7104m in accordance with BS410. 6 Assembly of abrasion apparatus The abrasion apparatus shall be assembled as shown in Figure 1 and Figure 2 and as follows. a) The test piece holder shall be adjusted so that when the lid of the abrasion chamber is bolted i
22、n position the75mm 50mm face of a test piece is inclined at45 to the centre line of the venturi and the distance between the centre of this face and the outlet of the venturi is38mm 2mm. NOTEThis distance may be adjusted by inserting a metal plate between either the flange of the venturi and the abr
23、asion chamber or the test piece holder and the lid of the chamber. b) Adjustments shall be made to the alignment of the test piece holder and venturi so that in repeated trial runs the abrasive impacts centrally on the target area. c) Seals between the lid and abrasion chamber, the venturi flange an
24、d abrasion chamber shall be airtight (see Figure 2). d) Connections between the manometer, venturi and manometer-abrasion chamber shall be airtight and clipped. e) Trial runs shall be carried out to find the voltage or transformer setting necessary to give a pressure difference of2505mm of water pre
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