This standard specifies the dry sieving method for determining the particle size composition of magnesium powder and aluminum-magnesium alloy powder. This standard is applicable to the determination of the particle size composition of magnesium powder or aluminum-magnesium alloy powder whose particle size is all or mostly greater than 56μm. GB/T 4108-2004 Determination of the particle size composition of magnesium powder and aluminum-magnesium alloy powder Dry sieving method GB/T4108-2004 Standard download decompression password: www.bzxz.net

ICS77.040.30
National Standard of the People's Republic of China
GB/T4108—2004
Replaces GB/T4108—1983
Magnesium powder and aluminium-magnesium alloy powderdetermination of particle size—Dry sieving method2004-04-30Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implementation on October 1, 2004
This standard is a revision of GB/T4108—1983. The main contents of this revision are as follows:
Deleted the provisions on sampling methods;
Added several sieves with different mesh sizes. This standard was proposed by the China Nonferrous Metals Industry Association. Foreword
This standard is under the jurisdiction of the National Technical Committee for Standardization of Nonferrous Metals. This standard was drafted by Northeast Light Alloy Co., Ltd. The main drafter of this standard is Han Shuchao.
This standard is interpreted by the National Technical Committee for Standardization of Nonferrous Metals. The previous versions of the standards replaced by this standard are: -GB/T 4108-1983.
GB/T4108-2004
1 Scope
Determination of particle size composition of magnesium powder and aluminum-magnesium alloy powder Dry sieving method
This standard specifies the determination of the particle size composition of magnesium powder and aluminum-magnesium alloy powder by dry sieving method. GB/T 4108-2004
This standard is applicable to the determination of the particle size composition of magnesium powder or aluminum-magnesium alloy powder with all or most of the particle size greater than 56um. 2 Normative references
The provisions in the following documents become the provisions of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB5149.1 Magnesium powder Part 1 Milling magnesium powder
GB/T5150 Aluminum-magnesium alloy powder
GB/T6003.1 Metal wire mesh test sieve GB/T6003.2 Metal perforated plate test sieve
GB/T6003.3 Electroformed sheet test sieve
GB/T6005 Test sieve Basic dimensions of mesh holes for metal wire mesh, perforated plate and electroformed sheet 3 Principle of the method
Put a certain amount of test material on a standard sieve, and with the help of vibration, pass through a series of sieves with different apertures, and sieve and weigh them in turn to calculate the composition of various particle sizes.
4 Sampling
Sampling shall be carried out in accordance with the methods specified in GB5149.1 and GB/T5150. 5 Equipment and Instruments
5.1 Test sieve: The test sieve shall comply with the requirements of GB/T6003.1. The size of the sieve frame is 200mm×50mm, and the mesh size of the sieve shall comply with the requirements of GB/T6005, which are: 1600μm, 1000μm, 850μm, 800μm, 700μm, 630μm, 500μm, 450μm, 400μm315μm.250μm.200μm, 180μm, 160μm, 154μm.140μm, 100μm.80μm, 76μm71μm, 60μm. The mesh size not specified in GB/T6005 shall be determined by negotiation between the supply and demand parties. After negotiation between the supply and demand parties, the test sieves specified in GB/T6003.2 or GB/T6003.3 may also be used. 5.2 Screen vibrating machine: an eccentric vibrating screen vibrating machine (i.e., during the vibrating process, the test sieve can be shaken in a circular motion and vibrated up and down). The shaking frequency is 290 times/min, and the vibration is 145 times.
5.3 Industrial balance: maximum weighing 500g, sensitivity 10mg. 5.4 Stopwatch.
6 Determination steps
6.1 Select the test sieve and series of sieves according to the corresponding magnesium powder or aluminum-magnesium alloy powder grades in GB5149.1 and GB/T5150. 6.2 Weigh 50.00g of the sample (4) to an accuracy of 0.01g (m.). 1
GB/T4108—2004
6.3 Place the sample (6.2) on the top sieve, then cover it and fasten the series of sieves to the vibrating screen machine (5.2) and vibrate for 30 minutes. 6.4 Remove the series of sieves, weigh the mass of magnesium powder or aluminum-magnesium alloy powder on each sieve (mi+), and calculate the mass of magnesium powder or aluminum-magnesium alloy powder under each sieve (mi-). 6.5 When the magnesium powder or aluminum-magnesium alloy powder on any sieve is less than 0.3%, it is determined that all of them have passed. 6.6 The screening loss is not allowed to be greater than 1%. If it is greater than 1%, re-sample and measure. 7 Calculation of measurement results
7.1 Calculate the mass fraction w(Si+) (%) of magnesium powder or aluminum-magnesium alloy powder on each sieve according to formula (1): w(S:+) = mi+×100
Wherein:
w(Si+)-
mass fraction of magnesium powder or aluminum-magnesium alloy powder on the second sieve, in mass fraction (%); mass of magnesium powder or aluminum-magnesium alloy powder on the i-th sieve, in grams (g); mass of test sample, in grams (g).
7.2 Calculate the mass fraction (S;-) (%) of magnesium powder or aluminum-magnesium alloy powder under each sieve according to formula (2): w(S:) = m= × 100
Wherein:
w(S;-)
-mass fraction of magnesium powder or aluminum-magnesium alloy powder under the ith sieve, in mass fraction (%); mass of magnesium powder or aluminum-magnesium alloy powder under the ith sieve, in grams (g); mo—mass of the sample, in grams (g). 8 Test report
The test report shall include the following:
a) the number of this standard,
necessary instructions for identifying the sample;bZxz.net
measurement results;
d) operations not specified in this standard;
any circumstances that may affect the results
(2)
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