BS EN 821-3:2005 pdf free.Advanced technical ceramics —— Monolithicceramics.Thermophysical properties——Determination of specific heatcapacity.
BS EN 821-3 This document specifies two methods for the determination of specific heat capacity of advanced monolithictechnical ceramic materials based on drop calorimetry (Method A) and differential scanning calorimetry (DSC,Method B) over a temperature range from room temperature upwards, depending on the design of theequipment.
NOTE1 The methods described apply in the case of test materials free from phase transformations, annealing effects orpartial melting. If any such effect occurs in a material over the temperature range of the test, spurious results will beobtained unless the data are carefully analysed. In such cases it is usually necessary to conduct repeat tests at a numberof temperatures close to the discontinuity, in order to estimate correctly its contribution to the apparent heat capacity.
NOTE2 Care should be exercised in both methods over the selection of the cell or crucible material and in theselection of the test atmosphere，especially at high temperatures.Test pieces can react with the crucible or theatmosphere, leading to spurious results. In general, an awareness of such problems should be maintained at all ime.Especially with regard to Method B, awareness should also be maintained of radiation effects at temperatures above1000 °C, and of the reproducibility of the output signal.
The following referenced documents are indispensable for the application of this document.For datedreferences，only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
EN 60584-1，Thermocouples Part 1: Reference tablesEN 60584-2，Thermocouples Part 2: Tolerances
EN ISOIEC 17025:2000,General requirements for the competence of testing and calibration laboratories(ISO/IEC 17025:1999)
A test piece, sealed in a crucible where necessary, is heated to the required temperature suspended in avertical tube furnace positioned above a receiving calorimeter.A shutter prevents radiative heat from thefurnace from reaching the calorimeter. The calorimeter may be any suitable device for recording the totalamount of heat extracted from the test piece to cool it to the ambient temperature. The test piece, or cruciblecontaining the test piece, is allowed to drop through the shutter into the calorimeter. The response of thecalorimeter is monitored continuously.The output curve is analysed, incorporating the calibrated response ofthe calorimeter and of the crucible if used, and the mean specific heat capacity is calculated.BS EN 821-3 pdf download.