GB/T 38516-2020 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 38516-2020 | English | 105 |
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Permeable sintered metal materials - Determination of average pore size of medium flow
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GB/T 38516-2020: Permeable sintered metal materials - Determination of average pore size of medium flow
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38516-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
H 70
Permeable sintered metal materials - Determination of
average pore size of medium flow
Issued on: MARCH 06, 2020
Implemented on: FEBRUARY 01, 2021
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... 4
4 Sample... 5
5 Instruments... 5
6 Test procedure... 6
7 Test data processing... 7
8 Test report... 8
Permeable sintered metal materials - Determination of
average pore size of medium flow
1 Scope
This Standard specifies the method for determining the average pore size of
medium flow of permeable sintered metal materials, including the requirements
for samples, instruments, test procedures, test data processing and test report.
This Standard applies to the determination of average pore size of medium flow
of permeable sintered metal materials.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 5163, Sintered metal materials, excluding hardmetals - Permeable
sintered metal materials - Determination of density, oil content, and open
porosity
GB/T 5249, Permeable sintered metal materials - Determination of bubble
test pore size
GB/T 31909, Permeable sintered metal materials - Determination of the air
permeability
3 Principle
The average pore size of medium flow is an extension and combination of the
bubble test pore size and the gas permeability test method. Call the sample that
is not wetted by liquid dry sample, and the sample that is wetted by liquid wet
sample.
First, test the flow-differential pressure curve of the dry sample; then, use liquid
to completely soak the sample; test the flow-differential pressure curve of the
wet sample. During the test of the wet sample, when the first bubble appears,
continue to increase the gas pressure; as the liquid that is immersed in the pore
is gradually pushed out, the gas flow rate will gradually increase. When the
differential pressure through the sample reaches a certain value, the gas flow
to different flow rates. Generally, depending on the flow range of the instrument,
roughly divide the flow rate into at least 5 points within its range, to respectively
measure the corresponding differential pressure values.
6.2 Measurement of wet sample flow-differential pressure
According to the requirements of GB/T 5249, soak the sample; place the
soaked sample on the fixture and seal. For the convenience of observation,
pour a small amount of soaking liquid on the surface of the clamped sample;
the height of the liquid level is less than 1 mm. Then, open the control valve;
ventilate slowly; gradually increase the gas flow. When the flow meter of the
lowest range has a display value, record the corresponding pressure; continue
to increase the gas flow. At this time, the differential pressure value also
increases. Record the differential pressure value corresponding to each flow
value, until the liquid that soaks the sample is completely blown dry by gas.
7 Test data processing
According to the recorded data, draw the sample dry curve (straight line) and
wet curve; then, draw the angle bisector of the dry curve and the abscissa
(differential pressure). The intersection of the angle bisector and the wet curve
is the medium flow differential pressure point. Read the differential pressure
value at this point on the graph, which is the medium flow differential pressure
value. See Figure 3.
Notes.
Q -- the gas flow through the sample;
p -- the differential pressure that is generated after the gas passes through the
sample.
Figure 3 -- Diagram of flow-differential pressure curve
After determining the medium flow differential pressure value, calculate the
average pore size of medium flow according to Formula (1). When the average
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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