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YS/T 1297-2019 PDF in English

YS/T 1297-2019 (YS/T1297-2019, YST 1297-2019, YST1297-2019)
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YS/T 1297-2019: PDF in English (YST 1297-2019)

YS/T 1297-2019
ICS 77.160
H 16
Measuring method for sphericity ratio of titanium and
titanium alloy powders
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Method principle ... 5
5 Reagents and materials ... 5
6 Instruments and equipment ... 5
7 Samples ... 5
8 Test steps ... 5
9 Test data processing ... 7
10 Test report ... 7
Measuring method for sphericity ratio of titanium and
titanium alloy powders
1 Scope
This standard specifies the method for determining the sphericity ratio of titanium and
titanium alloy powders.
This standard is applicable to the determination of the sphericity ratio of titanium and
titanium alloy powders, which have particle sizes of 5 μm ~ 250 μm. The determination
of the sphericity ratio of titanium and titanium alloy powders or other metal powders of
other particle sizes can also refer to this standard.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 5314 Powders for powder metallurgical purposes - Sampling
3 Terms and definitions
The following terms and definitions apply to this document.
Sphericity particle
The particle which has a ratio -- of the length of the major axis TO the length of the
minor axis of the powder grain -- not greater than 1.2.
Sphericity ratio
The ratio -- of the number of sphericity particles to the total number of particles in
the test powder.
4 Method principle
Use an optical microscope or scanning electron microscope to directly observe the
particle morphology. Use vertical projection method or scanning imaging method, to
measure the size of powder particles, to obtain the major axis length and minor axis
length of the particles, respectively. Particles which have a ratio -- of major axis length
to minor axis length -- not greater than 1.2, can be regarded as sphericity. Through
statistics and calculation, the sphericity ratio of the powder can be obtained.
5 Reagents and materials
5.1 Reagents
Dispersant for optical measurement: Absolute ethanol.
5.2 Materials
5.2.1 Glass slide: 75 mm × 25 mm × 2 mm ordinary glass.
5.2.2 Conductive adhesive.
6 Instruments and equipment
6.1 Optical microscope: The magnification can reach 1000 times. It shall be calibrated
by a qualified agency; the minimum calibration graduation is 0.01 mm.
6.2 Scanning electron microscopy.
7 Samples
The titanium and titanium alloy powder, which is used for measurement, shall be dry
and free of foreign matter. Samples shall be taken according to the provisions of GB/T
5314; the number of samples shall meet the test requirements.
8 Test steps
8.1 Optical microscopy
8.1.1 Place the prepared powder sample on a clean glass slide. Then add a few drops of
absolute ethanol with a dropper. Use another glass slide to scrape it. The scraper shall
be uniform, so that the powder is well dispersed and shall not damage the powder
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.