BS 6043-4 12-1992 Methods of sampling and test for carbonaceous materials used in aluminium manufacture - Cold ramming pastes - Determination of the thermal conductivity of baked r.pdf

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1、BRITISH STANDARD BS 6043-4.12: 1992 Methods of sampling and test for Carbonaceous materials used in aluminium manufacture Part 4: Cold ramming pastes Section 4.12 Determination of the thermal conductivity of baked rammed paste NOTEIt is recommended that this Section be read in conjunction with the g

2、eneral information in BS6043-4.0, published separately.BS6043-4.12:1992 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15June1992 BSI 10-1999 The following BSI

3、references relate to the work on this standard: Committee reference CIC/24 Draft for comment 90/54852 DC ISBN 0 580 20919 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committ

4、ee CIC/24, upon which the following bodies were represented: Aluminium Federation British Ceramic Research Ltd. Chemical Industries Association Institute of Petroleum Refractories Association of Great Britain Amendments issued since publication Amd. No. Date CommentsBS6043-4.12:1992 BSI 10-1999 i Co

5、ntents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Apparatus 1 4 Sampling 1 5 Preparation of test sample 1 6 Procedure 1 7 Calculation and expression of results 1 8 Test report 1 Publication(s) referred to Inside back coverBS6043-4.12:1992 ii BSI 10-1999 Fore

6、word This Section of BS6043 has been prepared under the direction of the Chemicals Standards Policy Committee to provide a method of test for cold ramming pastes used in the production of aluminium. There is no corresponding International Standard; however, it is intended, upon publication of this S

7、ection of BS6043, that it be offered to the International Organization for Standardization (ISO) for possible adoption as an International Standard. It is essential to use BS1902-5.8 and BS6043-4.1, BS6043-4.6 and BS6043-4.7 in conjunction with this Section of BS6043. This standard describes a metho

8、d of test only, and should not be used or quoted as a specification defining the characteristics of a product. Reference to this Section should indicate that the method of test used is in accordance with BS6043-4.12:1992. A British Standard does not purport to include all the necessary provisions of

9、 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, pages 1 and 2, an inside

10、 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 the inside front cover.BS6043-4.12:1992 BSI 10-1999 1 1 Scope This Section of BS6043 describes a method for determination of th

11、e thermal conductivity of test pieces prepared from baked rammed cold ramming paste by a split-column method. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle A baked test piece of known dimensions is produced from a test sample of the

12、cold ramming paste by compaction under regulated conditions followed by baking according to a defined programme. A thermal conductivity test piece of standard dimensions is cut from the baked test sample. The thermal conductivity test piece is located between two alloy steel blocks of known thermal

13、conductivity and surrounded by a non-oxidizing atmosphere and the quantity of heat flowing through the test piece is determined by measurement of temperature gradients and reference to thermal conductivity data. 3 Apparatus 3.1 Ordinary laboratory apparatus, and the apparatus described in3.2 and3.3.

14、 3.2 Ramming apparatus, and the other apparatus described in clause4 of BS6043-4.7:1991. 3.3 Thermal conductivity apparatus, described in clause6 of BS1902-5.8:1992. 4 Sampling Prepare a representative laboratory sample of cold ramming paste in accordance with BS6043-4.1. 5 Preparation of test sampl

15、e Prepare a test sample from the laboratory sample (see clause4) by the methods described in 7.1 and7.3 of BS6043-4.7:1991. 6 Procedure 6.1 Preparation of baked test piece Prepare a rammed test piece by ramming the test sample (see clause5) by the procedure described in8.2 of BS6043-4.7:1991 using t

16、he ramming apparatus (3.2). If the cold ramming paste requires pre-curing before being baked, pre-cure the test piece in accordance with 8.3 of BS6043-4.7:1991. Bake the rammed test piece in accordance with 8.4 of BS6043-4.7:1991. NOTEA baked test piece so prepared may first be used for the determin

17、ation of electrical resistivity by the method described in BS6043-4.8. 6.2 Preparation of thermal conductivity test piece If the baked test piece (see6.1) has a diameter greater than50.5mm, machine it to produce a cylinder of diameter50 0.5mm. If the diameter of the test piece is less than49.5mm, re

18、ject the test piece and prepare a replacement from a fresh test sample (see clause5). Produce a thermal conductivity test piece50 0.5mm in diameter and25 0.5mm in length from the baked test piece (see6.1) in accordance with clause7 of BS1902-5.8:1992. 6.3 Determination Determine the thermal conducti

19、vity of the test piece, prepared in accordance with6.2, in accordance with clause8 of BS1902-5.8:1992. 7 Calculation and expression of results Calculate the thermal conductivity of the test piece, prepared in accordance with6.2, in W/mK, in accordance with clause 9 of BS1902-5.8:1992 and express the

20、 result to three significant figures. 8 Test report The test report shall include the following information: a) a complete identification of the sample of cold ramming paste and any other treatment which it has received; b) a reference to this British Standard, i.e. BS6043-4.12:1992; c) the test res

21、ult expressed in accordance with clause7, including the mean temperature at which the determinations were made; d) the gas used to obtain a non-oxidizing atmosphere; e) the type of alloy steel block used as a reference material, and a clear reference to the thermal conductivity data used; f) any unu

22、sual features noted during the test; g) any operation not included in this British Standard or regarded as optional.2 blankBS6043-4.12:1992 BSI 10-1999 Publication(s) referred to BS 1902, Methods of testing refractory materials. BS 1902-5, Refractory and thermal properties. BS 1902-5.8, Determinatio

23、n of thermal conductivity (split column method) (method 1902-508). BS 6043, Methods of sampling and test for carbonaceous materials used in aluminium manufacture. BS 6043-4, Cold ramming pastes. BS 6043-4.0, General introduction 1) . BS 6043-4.1, Methods of sampling. BS 6043-4.6, Determination of ma

24、ximum rammed apparent density of unbaked paste 2) . BS 6043-4.7, Preparation of baked rammed test pieces and determination of baked apparent density, change in volume and loss in mass. BS 6043-4.8, Determination of electrical resistivity of baked rammed paste. 1) Referred to on the front cover only.

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