GB/T 5165-1985 Determination of oil content of permeable sintered metal materials GB/T5165-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Permeable sintered metal materials
Determination of oil content
Permeable sintered metal materialsDetermination of oil contentThis standard specifies the method for determining the oil content of permeable sintered metal materials. This standard is equivalent to ISO2737 "Permeable sintered metal materials-Determination of oil content". UDC 669-492.8
GB5165-85
This standard is particularly applicable to sintered metal porous bearings and mechanical parts made of metal powder without molding and sintering. Principle
Use an appropriate solvent to extract the oil contained in the sintered sample, weigh the mass before and after extraction, and calculate the oil content from the lost mass. 2 Sample
The sample is usually the part itself, and the sample volume is less than 0.5cm3. Several samples can be collected together for measurement. When the sample is too large, it can be broken into small pieces for testing. It is best to use a whole piece of sample (not more than 200g) for testing. 3 Instruments and reagents
3.1 Soxhlet extractor (as shown in Figure 1) Circulating cooler
Cylindrical filter paper
National Bureau of Standards 1985-05-08 Issued
1986-02-01 Implementation
3.2 Vacuum oil immersion device
GB5165--85
Can make the sample oil-free under vacuum. The pressure in the container should be reduced to between 0.1bar (75mmHg) and 0.01bar (7.5mmlg).
3.3 Analytical balance
It should have enough capacity to weigh the sample mass accurately to 0.01%. 3.4 The container for distilled water
should be large enough to hold the sample and the weighing device (as shown in Figures 2 and 3). a) Weighing in air
a) Weighing in air
3.5 Dryer---oven
The temperature inside the container can be maintained at 110±5℃. 3.6 Diffusion oil of known density
If the density of the oil is unknown, it can be determined by the specific gravity bottle method. 3.7 Solvent for oil
b) Weighing in water
b) Weighing in water
The choice of solvent should ensure that the contained oil is completely dissolved. Usually light gasoline, ether or carbon tetrachloride is used as the solvent. 4 Test steps
4.1 Weigh the mass of the original (oil-containing) sample. : 4.2 In order to remove the oil contained in the sample, select a Soxhlet extractor of appropriate size to remove the oil. Usually, light gasoline, ether or carbon tetrachloride is used as solvent. The extraction time should be maintained for more than 3 hours. For larger and thicker samples, the extraction time should be extended. After extraction, dry at a temperature of 20 to 50°C above the boiling point of the solvent. Keep for 1 hour, cool to room temperature, and then weigh the sample. Repeat the extraction and drying until the weight loss of the last oil removal does not exceed 0.05%. 4.3 Waterproofing
Use a vacuum oil immersion device to completely immerse the sample so that water cannot enter the hole when weighing in distilled water. 4.4 Place the waterproofed sample in a weighing device or hang it with a fine nylon thread, weigh it in the air first, and then weigh it in water. 4.5 In order to remove bubbles attached to the sample, gently shake the sample in the water, or add 1 to 2 drops of wetting agent to the water. 4.6 The sample and water should be at the same temperature, usually the test temperature is room temperature. 5 Calculation and expression of results
Calculation of results
Where: P——-volume percentage of the indicated oil content, %; mz-m2
m,--the mass of the original (oil-containing) sample, g,--the mass of the deoiled sample weighed in air, g; mz
--the density of the original oil, g/cm2;
V—the volume of the sample, cm2. bzxz.net
It can be determined by the reduction in the mass of the sample when weighed in water, that is: mg-m
Where: m4-
the total mass of the oil-containing sample weighed in air (including the mass of the fine nylon thread), g: the total mass of the oil-containing sample weighed in water (including the mass of the fine nylon thread), g: 0——the density of water, g/cm2.
Expression of results
The percentage of oil content shall be calculated to the second decimal place and rounded to the first decimal place. Test report
The test report shall include the following points:
This national standard number;
Detailed description required for identification of the sample,
The results obtained and the test method applied,
The density of the sample oil used;
All other operations not specified or optional in this national standard, and detailed indication of all factors that may affect the results. Additional notes:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China and China National Nonferrous Metals Industry Corporation. This standard was drafted by the Central Iron and Steel Research Institute of the Ministry of Metallurgical Industry. The main drafter of this standard is Tang Guifen.
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