1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Fine ceramics (advanced ceramics, advanced technical ceramics) Thermophysical properties of ceramic composites Determination of specific heat capacityBS ISO 19628:2017 ISO 2017Fine ceramics (advanced ceramics, advanced
2、technical ceramics) Thermophysical properties of ceramic composites Determination of specific heat capacityCramiques techniques Proprits thermophysiques des composites cramiques Dtermination de la capacit thermique specifiqueINTERNATIONAL STANDARDISO19628First edition2017-04Reference numberISO 19628
3、:2017(E)National forewordThis British Standard is the UK implementation of ISO 19628:2017.The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics.A list of organizations represented on this committee can be obtained on request to its secretary
4、.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 86685 2ICS 81.060.30Compliance with a British Standard cannot conf
5、er immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 19628:2017 ISO 2017Fine ceramics (advanced ceramics, advanc
6、ed technical ceramics) Thermophysical properties of ceramic composites Determination of specific heat capacityCramiques techniques Proprits thermophysiques des composites cramiques Dtermination de la capacit thermique specifiqueINTERNATIONAL STANDARDISO19628First edition2017-04Reference numberISO 19
7、628:2017(E)BS ISO 19628:2017ISO 19628:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or m
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9、SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 19628:2017ISO 19628:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Method A drop calorimetry. 24.1 Principle 24.2 Apparatus 24.3 Standard reference materials . 24.4 Test specimens
10、 24.5 Calibration of calorimeter . 34.5.1 General 34.5.2 Electrical calibration 34.5.3 Calibration using standard reference material 34.6 Test procedures 34.6.1 Test without a crucible . 34.6.2 Test with a crucible 44.6.3 Description of test. 44.7 Calculations 54.7.1 General 54.7.2 Determination of
11、the calorimetric calibration factor . 54.7.3 Determination of mean specific heat capacity Cp.55 Method B differential scanning calorimetry . 65.1 Principle 65.1.1 General 65.1.2 Stepwise heating method . 65.1.3 Continuous heating method . 75.2 Apparatus 85.3 Standard reference materials, SRM . 85.4
12、Test specimens 85.5 Temperature calibration . 85.6 Test procedure for the determination of Cp85.6.1 General 85.6.2 Method 1: Measurements requiring the knowledge of the K factor 95.6.3 Method 2: measurements requiring the use of a reference standard material (SRM) .115.7 Calculation of results 145.7
13、.1 Method requiring the knowledge of the K factor 145.7.2 Method using an SRM .166 Test report 17Annex A (normative) Drop calorimetry determination of the calibration factor using standard reference material .18Annex B (informative) Standard reference material 20Annex C (informative) Materials for c
14、alorimeter calibrations .25Bibliography .26 ISO 2017 All rights reserved iiiContents PageBS ISO 19628:2017ISO 19628:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International
15、Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, al
16、so take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1.
17、In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the ele
18、ments of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations receiv
19、ed (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, a
20、s well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .htmlThis document was prepared by Technical Committee ISO/TC 206, Fine ceramics.iv ISO 2017 All rights reservedBS
21、ISO 19628:2017INTERNATIONAL STANDARD ISO 19628:2017(E)Fine ceramics (advanced ceramics, advanced technical ceramics) Thermophysical properties of ceramic composites Determination of specific heat capacity1 ScopeThis document describes two methods for the determination of the specific heat capacity o
22、f ceramic matrix composites with continuous reinforcements (1D, 2D, 3D).Unidirectional (1D), bi-directional (2D) and tridirectional (XD, with 2 T 8,61 K: T0= 8,61 K A3= +0,450 764E-02A0= 0,514 7E+01 A4= 0,514 64E-03Cp= exp (P1) J-mol-1K-1A1= +0,341 27E+00 A5= +0,397 864E-04A2= 0,333 446E-01 A6= 0,15
23、2 136E-05125,0 K T 45,0 K: T0= 40,0 K A3= +0,951 73E-04A0= +0,696 6E+00 A4= 0,359 10E-05Relative enthalpy (continued) ISO 2017 All rights reserved 23BS ISO 19628:2017ISO 19628:2017(E)Cp= P2J-mol-1K-1A1= +0,593 87E-01 A5= 0,649 8E-07A2= +0,403 57E-02 A6= +0,408 9E-08273,15 K T 125,0 K: T0= 125,0 K A3
24、= 0,839 67E-04A0= +0,219 93E+02 A4= +0,191 33E-05Cp= P3J-mol-1K-1A1= +0,388 53E+00 A5= 0,317 78E-07A2= +0,139 55E-02 A6= +0,295 62E-09Above 273,15 K, enthalpy and heat-capacity values were derived from the following equation:H1-H273,15= AT-2+ BT-1+ CInT + K + DT + ET2+ FT3+ GT4+ HT5J-mol-1A = +6,625
25、 3E+07 E = 8,575 16E-02B = 4,542 38E+06 F = +4,299 063E-05C = 5,475 599E+04 G = 1,151 92E-08K = +2,581 970 2E+05 H = +1,263 51E-12D = +2,574 076E+02 Low-temperature measurements from 10 to 380 K were made with a vacuum adiabatic calorimeter 1.2 operated automatically under the control of a minicompu
26、ter. Enthalpy measurements at 18 temperatures from 273 to 1 173 K were made by the drop method using a Bunsen ice calorimeter 3.4. From 1173 to 2 250 K, enthalpy measurements were made with an adiabatic receiving calorimeter 5.6. All temperatures are expressed on the IPTS-68 scale. In the correction
27、 of specimen mass data for atmospheric buoyancy, a density of 3,97 g.cm-3for -AI2O3was assumed. The functions presented were fitted by the method of least squares to these data. The tabulated values were calculated using these functions.An occasional particle may contain an end smear due to the meth
28、od employed in cutting the material. These smears do not contribute significantly to the enthalpy values given in this certificate. However, it is recommended that the material be heated to 1 000 C in air prior to heat-capacity measurements below 350 K. Microprobe analyses indicate small quantities
29、of chloride, titanium, calcium, silicon, iron, copper, and zinc on the surfaces. Spectrographic examination indicates the purity of the bulk material to be at least 99,95 + percent, with the major impurities being magnesium, calcium, chromium, iron, silicon, and titanium. Examination by atomic absor
30、ption spectrometry for magnesium, indicated as the major impurity by the above tests, shows that the surface contamination by this element amounts to 1 ppm, or less, and that the bulk material contains 10 ppm, or less, of magnesium. In addition, the material absorbs a small amount (30 ppm or less, p
31、resumably moisture) of weight on the ground surfaces on exposure to room air, and may require heating in an inert atmosphere, if this amount of moisture is of concern. Combustion analysis in oxygen indicates the material contains on the order of 10 ppm or less of carbonaceous material calculated as carbon.24 ISO 2017 All rights reservedBS ISO 19628:2017
