This standard specifies the method and requirements for calculating the relative viscosity, relative fluidity and thixotropy of mud by the time it takes for 100 mL of water and mud to flow out after being fully stirred for a certain period of time. This standard is applicable to the determination of relative viscosity, relative fluidity and thixotropy of ceramic mud. QB/T 1545-1992 Method for determination of relative viscosity, relative fluidity and thixotropy of ceramic mud QB/T1545-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Method for Determination of Relative Viscosity, Relative Fluidity and Thixotropy of Ceramic Slurry
1 Subject Content and Scope of Application
QB/T1545—1992
This standard specifies the method and requirements for calculating the relative viscosity, relative fluidity and thixotropy of slurry by the time taken for 100 mL to flow out after the water and slurry are fully stirred and left to stand for a certain period of time. This standard is applicable to the determination of relative viscosity, relative fluidity and thixotropy of ceramic slurry. 2 Terminology
2.1 Relative Viscosity
The ratio of the time taken for a certain volume of slurry to flow out 100 mL from the Engela viscometer after being stirred and left to stand for 30 seconds to the time taken for the same volume of water to flow out.
2.2 Relative Fluidity
The reciprocal of the relative viscosity of slurry.
2.3 Thixotropy
The ratio of the time taken for 100 mL of mud to flow out of the Engela viscometer after stirring and standing for 30 minutes to the time taken for the same volume of mud to flow out after stirring and standing for 30 seconds.
3 Instruments and equipment
Engla viscometer: outlet length (20±0.2) mm, outlet upper aperture (70±0.2) mm + lower aperture (5.0±0.2) mm. Inner surface roughness 3.2;
4 Sample
Stopwatch: graduation value is 0.1S:
Measuring cup: capacity 1000mL;
Glass thermometer: range 0～50C, graduation value 0.5C, two; Viscometer bearing bottle: capacity 100mL, three; Sieve: aperture 0.25mm;
Temperature controller: controllable graduation value ±1C; Stirrer.
Measure 1000mL of the mud that has been fully stirred and passed through a 0.25mm sieve. 5 Measurement steps
5.1 Adjustment of the level of the viscometer
Pour distilled water into the viscometer until the level of the water reaches the three pointed marks on the instrument. Adjust the instrument foot screws so that the plane where the three pointed marks are located coincides with the horizontal plane. 5.2 Adjustment of temperature controller
QB/T 1545--1992wwW.bzxz.Net
Pour water into the outer cylinder of the viscometer so that the horizontal plane is higher than the three pointed marks on the inner cylinder, insert the temperature probe into the water in the outer cylinder, adjust the temperature control knob to 30℃, turn on the power to heat, and stir with a stirrer at any time to make the water temperature uniform. When the temperature reaches (30±1)℃, test according to 5.3.5.4.
5.3 Determination of water outflow time
Place a 100ml receiving bottle under the outflow outlet of the viscometer. When the water temperature in the inner cylinder reaches (30±1)℃, pull up the plug at the outflow outlet, start the stopwatch at the same time, and record the time it takes to flow out 100ml of water. Repeat the test three times. The difference in the measured values ​​shall not be greater than 0.2s. The average value is taken as the water outflow time t.
5.4 Determination of mud outflow time
Release the water in the inner cylinder of the viscometer and wipe it clean. After fully stirring the mud to be tested, inject it into the inner cylinder of the viscometer until the liquid level of the injected mud reaches the three pointed marks of the instrument. Put a thermometer on the other hole on the inner cylinder cover to observe the mud temperature. When it is consistent with the temperature of the outer shell of the viscometer (30℃±1C), stir the mud carefully with a stirrer for about 5 minutes and then let it stand. According to the steps in 5.3, measure the time required for the mud to flow out 100ml after standing for 30s and 30min respectively. Repeat the test three times for each measurement, take the average value as the mud outflow time and record it separately. The average deviation of the three measured values ​​of standing for 30s shall not be greater than 0.5s, and the average deviation of the three measured values ​​of standing for 30min shall not be greater than 0.8$. Otherwise, it is necessary to re-measure. 6 Calculation formula
Where: V——-mud relative viscosity;
F\—mud relative fluidity;
T. Thixotropy of mud;
f----time for water to flow out 100 mL, t2-time for mud to flow out 100 mL after 30 seconds of rest, s; time for mud to flow out 100 mL after 30 minutes of rest + s. t
Additional remarks:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Ceramic Standardization Center. This standard is drafted by the Tangshan Ceramic Research Institute. (1)
(3))
The main drafters of this standard are Wang Zhen, Wu Zhaopei, Wang Suhuan and Bai Jie. From the date of implementation of this standard, the former Ministry of Light Industry standard QB895-1983 "Determination of relative viscosity, relative fluidity and thixotropy of daily-use ceramic mud and glaze slurry" shall be invalid.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.