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GB/T 43091-2023 (GB/T43091-2023)

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GB/T 43091-2023: PDF in English (GBT 43091-2023)

GB/T 43091-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
CCS H 22
Test method for compressive strength of powder
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
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 Terms and definitions ... 4
4 Method principle ... 5
5 Test conditions ... 6
6 Instruments and equipment ... 6
7 Sample ... 6
8 Test steps ... 6
9 Test data processing ... 7
10 Test report ... 8
Test method for compressive strength of powder
1 Scope
This document specifies the test method for compressive strength of powder.
This document is applicable to the determination of the compressive strength of
crushable spherical, spherical or irregular powders with a particle size of 5 μm ~ 50 μm.
This document does not apply to powders with obviously unequal shapes (such as flakes
and strips).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 19077, Particle size analysis -- Laser diffraction methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 crushing force
The test force when powder particles are crushed.
3.2 compressive strength of powder
The strength limit of powder particles when subjected to external pressure.
3.3 particle diameter
For spherical powders, it is the diameter of the powder particles. For spherical or
irregular-shaped powders, it is the "equivalent particle diameter" of the powder particles.
NOTE: "Equivalent particle diameter" is measured using the method in Figure 1. The equivalent
particle diameter d is the arithmetic mean of d1 and d2.
b) Use a soft lint-free cloth or clean paper to clean the test platform and indenter;
c) Turn on the equipment system and run it for 30 min;
d) Spread the powder to be tested evenly on the test platform;
e) Transfer the test platform to the objective lens of the micro-compression testing
machine and fix it. Set appropriate loading pressure and loading rate according to
sample characteristics;
f) Adjust the position of the test platform. Observe the particles in the viewing area
of the plane indenter. Select particles with a representative target particle diameter
(similar to D50);
g) Adjust the eyepiece or objective lens magnification so that a single particle is
located in the center of the plane indenter viewing area. Fine-tune the height of
the test platform to make the edges of the target particles clear. Measure the
particle diameter;
h) Fine-tune the height of the test platform again to move the target particles to the
apex and focus. Move the test platform under the flat indenter. Test and obtain the
test force and compression displacement curve;
i) The number of test particles shall be no less than 5. The number of test particles
can also be selected according to actual needs.
9 Test data processing
9.1 The compressive strength of powder is calculated according to formula (1):
Where,
pcs - Compressive strength, in MPa;
α - Calculation coefficient, taking 2.48;
Fyk - Crushing force, in millinewton (mN);
d - Particle diameter, in micron (μm).
9.2 The test results are given as the arithmetic mean of the compressive strength of the
test particles. Round to 1 MPa according to the provisions of GB/T 8170.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.