This standard specifies the principles, instruments and equipment and test procedures for the preparation of carbon paste test samples. This standard applies to the preparation of carbon paste test samples. YB/T 5054-2001 Preparation method of carbon paste test samples YB/T5054-2001 Standard download decompression password: www.bzxz.net

YB/T5054--2001
This standard is based on the original standard YB/T5054--1993 "Carbon paste test sample roasting method" and has made some revisions and additions to the original standard: the title of the standard,
the melting process in the sample preparation method;
the appendix of the original standard is incorporated into the main text.
This standard replaces YB/T5054--1993 "Carbon paste test sample roasting method" from the date of implementation. This standard is proposed and managed by the Metallurgical Industry Information Standards Research Institute. The drafting unit of this standard: Jilin Carbon Group Co., Ltd. The main drafters of this standard: Zhu Lijuan, Meng Xiangli, Wang Jun. This standard was first issued in 1993.
1 Scope
Standard of the People's Republic of China for the Preparation of Test Samples of Carbon Pastes
Method for Preparation Test Sample of Carbon Pastes This standard specifies the principle, instruments and equipment and test steps for the preparation of test samples of carbon pastes. This standard applies to the preparation of test samples of carbon pastes. 2 Referenced Standards
YB/T 5054—2001
Replaces YB/T 5054-1993
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1427—2000 Sampling Method of Carbon Materials 3 Principle
This preparation method simulates the sintering process when using carbon paste production. When the carbon paste is treated at high temperature, volatiles escape and the binder is carbonized, causing the carbon paste to form a solid with a certain mechanical strength. It is processed into samples of certain specifications for testing bulk density, resistivity, compressive strength and true density. 4 Instruments and equipment
4.1 High temperature furnace: with automatic temperature controller, which can control the heating speed and maintain constant temperature of 900℃±20℃ and 1200℃±20℃. 4.2 Thermocouple: platinum or nickel-chromium thermocouple, 750mm long. 4.3 Digital thermometer: measuring range is 0～1600℃, 2.5 level. Iron crucible: outer diameter 210mm, inner diameter 200mm, wall thickness 5mm, height 305mm. 4.4
4.5 Graphite crucible: outer diameter 220mm, inner diameter 200mm, wall thickness 10mm, bottom thickness 25mm, height 325mm. 4.6 Porcelain blood: 150mL.
4.7 Scale: sensitivity is 50g.
4.8 Sample iron cylinder: material is smooth iron sheet, specification is diameter × length 55mm × 400mm, wall thickness 0.3mm ~ 0.5mm. 4.9 Hydraulic press: 0 ~ 100t.
4.10 Pressing die: ordinary steel die with inner hole 50mm × 50mm, wall thickness greater than 10mm or inner diameter 50mm, wall thickness greater than 10mm. 4.11 Electric heating oven: 0 ~ ~ 300℃.
4.12 Filling material: less ash (ash content ≤ 1%) with particle size of 1mm ~ 4mm, burnt and coked. 5 Samples
5.1 Samples are taken according to GB/T1427. 5.2 The sample with a mass of not less than 5.5kg shall be crushed to less than 25mm without destroying the particle size composition, and divided into two portions by quartering method, each portion shall not be less than 2.6kg. One portion shall be kept as a sample, and the other portion shall be evenly divided into two portions, each portion is about 1.3kg. Approved by the State Economic and Trade Commission on July 9, 2001 374
Implementation on January 1, 2002
6 Preparation stepsbZxz.net
6.1 Preparation of carbon paste
YB/T 5054 -- 2001
6.1.1 Spread a 50 mm thick layer of filler evenly on the bottom of the iron crucible, wrap the lower end of the iron cylinder with ordinary newsprint (it is better if the newsprint is brushed with a layer of graphite powder mixed with engine oil), and stand it upright in the crucible (each crucible can only hold 4 iron cylinders at most), the distance between the iron tube and the crucible wall is 20 mm, and the distance between the cylinders is about 15 mm. Place the thermocouple in the center of the crucible with its hot end parallel to the bottom of the iron cylinder, and fill all the gaps in the crucible with filler.
6.1.2Put two samples of 1.3kg each into two iron crucibles respectively. After filling, keep the remaining samples for standby. 6.1.3Put the iron crucible filled with samples into the constant temperature zone of the high-temperature furnace. 6.1.4Power on the high-temperature furnace for heating, and control the heating rate to (100±20)℃/h. After gradually heating up, the samples in the iron crucible melt and the sample surface drops. At this time, add the remaining samples into the iron crucible in batches (the remaining samples should be added when the furnace temperature is less than 200℃), and heat to 900℃. Keep at 900℃±20℃ for 3h and then stop heating. Wait for the high-temperature furnace to cool naturally to below 100℃ and then take out the iron crucible. 6.1.5Take out the sample from the iron crucible and remove the filling material at the bottom of the sample. Each sample is cut off from the bottom by 10mm and then processed into a cylindrical sample with a diameter of 45mm×40mm for testing bulk density, resistivity, compressive strength and true density. 6.2 Preparation of rough seam paste
6.2.1 Weigh 5 samples of about 210g each (about 180g for each cylindrical sample), put them into 5 magnetic bloods respectively, and put them in an electric oven for softening. The temperature shall not exceed 130℃. 6.2.2 Pour the hot paste sample into the mold and pressurize it at a pressure of 5000N/cm±100N/cm2 for 30s to make a 50mm×50mm×50mm cube or a 50mm×50mm cylindrical sample. 6.2.3 Put the formed sample into a graphite crucible with a 50mm thick filler on the bottom, and place the thermocouple in the center of the crucible. Fill all the gaps in the crucible with filler and put the crucible into the constant temperature zone of the high-temperature furnace. 6.2.4 Turn on the high temperature furnace for heating at a rate of (150 ± 20) ℃/h. When the temperature reaches 1200 ℃, keep it warm for 3 hours. Stop heating and remove the crucible after cooling to room temperature.
6.2.5 Remove the filler attached to the surface of the sample and grind the two ends of the pressure-bearing surface of the sample flat before the compressive strength test can be carried out. 375
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