GB/T 36133-2018 English PDF (GBT36133-2018)

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GB/T 36133-2018: Refractory materials -- Determination of thermal conductivity (Platinum resistance thermometer method)
GB/T 36133-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.080
Q 40
Refractory materials - Determination of thermal
conductivity (Platinum resistance thermometer
method)
ISSUED ON: MAY 14, 2018
IMPLEMENTED ON: APRIL 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Principle ... 5 
4 Equipment ... 5 
5 Sample selection and sample preparation ... 9 
6 Installation ... 11 
7 Test steps ... 11 
8 Calculation ... 14 
9 Expression of test results ... 17 
10 Test report ... 18 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Attention is drawn to the possibility that some of the elements of this Standard
may be the subject of patent rights. The issuing authority shall not be held
responsible for identifying any or all such patent rights.
This Standard was proposed by and shall be under the jurisdiction of National
Technical Committee on Refractory Materials of Standardization Administration
of China (SAC/TC 193).
The drafting organizations of this Standard: Wuhan University of Science and
Technology, Yixing Morgan Thermal Ceramics Co., Ltd., Sinosteel Luoyang
Refractory Research Institute Co., Ltd., Hubei Provincial Refractory Product
Quality Supervision and Inspection Station.
Main drafters of this Standard: Yin Yucheng, Li Yiwei, Zhu Qingyou, Yin Bo, Bai
Chen, Liu Zhiqiang, Peng Xigao, Ge Shan.
Refractory materials - Determination of thermal
conductivity (Platinum resistance thermometer
method)
1 Scope
This Standard specifies the principle, equipment, specimen, installation, test
steps, result calculation and test report for determination of thermal conductivity
of refractory materials by platinum resistance thermometer method.
This Standard is applicable to determination of thermal conductivity of refractory
materials that have no carbon, no electrical conductivity and thermal
conductivity is not more than 15W/(m·K).
NOTE 1: The test temperature range of this Standard is from room temperature to 1500°C.
The upper limit of the test temperature also depends on the extreme temperature of the
material or the temperature at which the refractory material becomes a conductor.
NOTE 2: It is generally difficult to obtain accurate test values for heterogeneous materials,
especially for materials containing fibers. When using this method to test these materials,
it needs to be agreed by the relevant parties.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 4513.5, Monolithic (unshaped) refractory products - Part 5: Preparation
and treatment of test pieces
GB/T 5977, Platinum wires for resistance thermometers
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 17911, Methods of test for refractory fibre products
GB/T 31057.1, Granular materials - The physical properties - Part 1:
4.1.2 Heating furnace
The heating chamber of the heating furnace shall be able to accommodate two
straight bricks of 230mm×114mm×75mm. Set two support frames at the bottom
to make the test piece evenly heated. The temperature of the heating furnace
at each test temperature point is controlled to ±5°C. The temperature difference
between any two points of the test piece is not more than 10°C. The
temperature shall be stable within 15min before the start of the heating step of
the hot wire. During the constant temperature period, the temperature
fluctuation measured by the thermocouple on the outside of the test piece shall
not exceed ±0.5°C. In addition, four holes shall be set on the furnace wall to
place four hollow alumina protective tubes. Two hot wire heating leads and two
resistance measuring leads are respectively buried in the protection tube. A
certain distance shall be maintained between the holes to reduce the
conductivity during the heating process.
4.1.3 Thermocouple
It is used to measure the temperature outside the test piece. It shall be
composed of platinum or platinum rhodium wire and match the final test
temperature.
4.1.4 Hot wire heating system
The hot wire heating system includes AC power, current divider and breaker.
Generate a stable current of 0A~10A (0V~50V). Hot wire heating shall use
stable alternating current. The test power shall be between 1W/m and 125W/m,
which is equivalent to 0.15W~18.75W of hot wire power between 150mm
resistance measurement leads. The system shall also have a device for
measuring current and voltage drop. Its full-scale accuracy should reach ±0.5%.
4.1.5 Data logging system
Data recording system includes DC power supply, digital voltmeter, program
recorder, relay, current divider. In order to measure the change of the resistance
of the hot wire, a low (such as 100mA) constant DC current needs to be
superimposed on the AC heating current of the hot wire. Record the DC voltage
drop of the hot wire section between the resistance measurement leads to
calculate the temperature change of the hot wire. Because the rate of change
of the hot wire resistance during measurement is only one millionth of its
absolute resistance value, it needs to use a data logging system with sufficient
resolution. The programmed digital voltmeter shall be able to automatically
change the range and automatically calibrate. The digital resolution is
(that is, the accuracy reaches six and a half digits). The sensitivity of the
temperature-time recording equipment shall be at least 0.2µV/mm, or the
5 Sample selection and sample preparation
5.1 Refractory brick
Choose 2 straight bricks with uniform structure and density or specimens of the
same size to form a test piece. The minimum size of a single specimen is
200mm×100mm×50mm. The recommended size is 230mm×114mm×65mm or
230mm×114mm×75mm. The hot wire measuring rack is placed in the center of
two closely contacted specimens. Process a step on the contact surface of the
upper and lower specimens, so as to embed hot wire, as shown in Figure 2.l
In order to ensure that the sample is in close contact with the hot wire, the
maximum height of the specimen step shall not be greater than 0.8mm. Ensure
that its minimum height is not less than the diameter of the hot wire used. In
order to ensure that the test piece does not shake, the average height error of
the two steps shall be within 0.1mm. In addition, the flatness of the upper and
lower specimen contact surfaces shall not be greater than 0.1mm/100mm. After
the steps are processed, put the two specimens together. Make the two steps
coincide with each other. Shake the test piece to detect whether it is shaking. If
it is not shaking, it shall pass the test. After the step height and the flatness of
the close contact surface have reached the requirements, the resistance
measurement lead groove is carved on the step of a specimen. In order to
match the solder joints of the hot wire and the resistance measurement lead,
tools can be used to dig pits at the solder joints for modification.
5.2 Refractory castable
Prepare refractory castable according to GB/T 45...