Sample Preparation
After drying at room temperature, each sample was crushed roughly into particles samller than 1.2mm by a jaw crusher and then ground for 30sec in a 10ml alumina vessel to produce a 2g sample by a vibration mill.
Quartz, kaolinite, feldspar, calcite and siderite were quantified by the X-ray profile method for 34 kinds of pottery stone samples.
Then the integrated intensity of each mineral was mesured.
The content ratio of the avove-mentiond minerals by the X-ray profile method shows good correlation with integrated intensity except for certain kinds of minerals.
A calibration curve was derived from this relationship for all 34 kinds of samples to calculate the content ratio of quartz, kaolinite, feldspar, calcite and siderite.
The content of sericite was a value which subtracted total amount of the above mineral from 100wt% because quantitification accuracy was poor due to a formulation effect.
Mesurement angle was 26.2° to 27.3° for quartz, 12.0° to 13.3° for kaolin, 27.3° to 28.3° for feldspar, 29.1° to 29.7° for calcite, and 31.5° to 32.5° for siderite.
Chemical composition was mesured by XRF.
The refractoriness by the measurement of the thermal expansion curve was predicted from the following correlative equation by using 58 samples with TS5 and SK by the JIS method.
The conditions for mesurement of thermal expansion were compaction pressure: 250MPa, pellet thickness: 3mm (diameter 10mm), heating rate: 10°C/min, loading: 10g.
TSK = -0.001931TS52+6.288TS5-3464
where TSK (°C) is the nominal temperature equivalent to its SK, TS5 (°C) is the temperature rectified using the following correlative equation.
TS5 = T5-0.728W10+29.12
where T5 (°C) is the temperature of the expansion coefficient becomes 0.0005/°C (refer to the measurement result), W10 (wt%) is the contents of particles larger than 10µm.
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