GB/T 5163-1985 Determination of density of permeable sintered metallic materials GB/T5163-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Permeable sintered metal materials
Determination of density
This standard specifies the method for determining the density of permeable sintered metal materials. UDC 669-492.8
GB 5163-85wwW.bzxz.Net
This standard is equivalent to the relevant parts of ISO 2738 "Permeable sintered metal materials-Determination of density and open porosity". This standard is particularly applicable to sintered metal porous bearings and mechanical parts made of metal powder by molding and sintering. 1 Principle
After cleaning, degreasing and drying, the sample is weighed in air. Then it is waterproofed, that is, it is soaked with an appropriate liquid or covered with a surface, and weighed again in air and water. The volume of the sample can be calculated from the reduction in mass when it is weighed in water, and the density can be calculated.
2 Sample
2.1 Clean the sample surface. If the sample contains oil, remove the oil with a Soxhlet extractor, then place it in a drying oven. After the temperature reaches 110℃, keep it for 1 hour and then cool it to room temperature. 2.2 If the sample volume is less than 0.5cm2, several samples can be collected and measured together. When the sample is too large, the sample can be broken into small pieces, but the density of all small pieces must be measured. The density of the sample is calculated using the total mass and total volume. The test report should indicate whether a whole piece or a small piece of sample is used. As much as possible, use a whole piece (less than 200g) of the sample for the test. 3 Instruments and reagents
3.1 The Soxhlet extractor is represented by a figure in GB5165-85 "Permeable sintered metal materials-Determination of oil content". 3.2 Analytical balance
It should have sufficient capacity and be able to weigh the sample mass accurately to 0.01%. 3.3 The container for distilled water
must be large enough to hold the sample and the weighing device (indicated by the attached figure in GB5165-85). 3.4 The oil diffusion device
can hold the sample and heat the oil.
3.5 The temperature in the dryer-oven
can be maintained at 110±5℃. 3.6 Immersion oil and vaseline
3.7 Solvent for oil
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. Test steps
4.1 Weigh the cleanest sample.
4.2 Waterproof treatment
4.2.1 The sample can be incompletely immersed (suitable for measuring volume), and the test time can be shortened. Issued by the National Bureau of Standards on May 8, 1985
Implemented on February 1, 1986
GB 5163—85
The sample is immersed in hot oil at 65±5℃ until no bubbles appear. After cooling to room temperature, the sample is taken out of the oil, and the excess oil on the surface is wiped off with absorbent paper or cloth. Be careful not to suck out the oil in the hole. It can be weighed. 4.2.2 The surface covering method can also be used (suitable for measuring volume), that is, vaseline is coated on the surface of the sample and the excess is removed. 4.3 The sample that has been spread with oil or covered on the surface is placed in a weighing device, or hung with a fine nylon thread, and weighed first in air and then in water.
4.4 In order to remove bubbles attached to the sample, the sample can be gently shaken in water, and 2 drops of wetting agent can be added to the water. 4.5 The sample and water should be at an intermediate temperature, usually the test temperature is room temperature. 5 Calculation and expression of results
Calculation of results
Formula: d-
--sample density, g/cm3,
--mass of dry (oil-free) sample weighed in air, g; m---total mass of oil-free sample weighed in air (including the mass of fine nylon thread), g; ms--total mass of oil-immersed sample weighed in water (including the mass of fine nylon thread), g; - density of water at test temperature, g/cm3. 5.2 Expression of results
Should be accurate to 0.01g/cm2.
6 Test report
The test report should include the following points:
a. This [national standard number;
Detailed description of the test specimen required for identification;
Results obtained and test methods applied,
Detailed description of all factors that may affect the results; Other operations not specified in this national standard or optional. Additional remarks:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China and China Nonferrous Metals Industry Corporation. This standard was drafted by the Iron and Steel Research Institute of the Ministry of Metallurgical Industry. The main drafter of this standard was Tang Guifen.
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