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GB/T 41737-2022 English PDF (GBT41737-2022)

GB/T 41737-2022 English PDF (GBT41737-2022)

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GB/T 41737-2022: Aluminum matrix composites - Test method for volume fraction of SiC - Dissolution method

This document describes the method principle, reagents, instruments and equipment, analysis steps, result calculation method, and test report for the determination of silicon carbide particle, whisker, and fiber volume fraction in silicon carbide particle, whisker, and fiber reinforced aluminum matrix composites. This document is applicable to the determination of silicon carbide particle, whisker, and fiber volume fraction in particle reinforced aluminum matrix composites with a reinforcement particle size greater than 3 ??m or whisker and fiber reinforced aluminum matrix composites with a diameter greater than 3 ??
GB/T 41737-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.040.99
CCS Y 80
Aluminum matrix composites - Test method for volume
fraction of SiC - Dissolution method
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ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: FEBRUARY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Principles of the method ... 4
4 Reagents ... 5
5 Instruments and equipment ... 5
6 Analysis steps ... 5
7 Calculation of results ... 6
8 Test report ... 7
Aluminum matrix composites - Test method for volume
fraction of SiC - Dissolution method
1 Scope
This document describes the method principle, reagents, instruments and equipment, analysis steps, result calculation method, and test report for the determination of silicon carbide particle, whisker, and fiber volume fraction in silicon carbide particle, whisker, and fiber reinforced aluminum matrix composites.
This document is applicable to the determination of silicon carbide particle, whisker, and fiber volume fraction in particle reinforced aluminum matrix composites with a reinforcement particle size greater than 3 ??m or whisker and fiber reinforced aluminum matrix composites with a diameter greater than 3 ??m.
2 Normative references
The following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced documents, only the latest version (including all the amendments) is applicable to this document.
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 3850 Impermeable sintered metal materials and hardmetals - Determination of density
GB/T 6682 Water for analytical laboratory use - Specification and test methods JB/T 11433 Conventional abrasive - Determination of density
3 Principles of the method
An acidic solvent that can dissolve the aluminum matrix but not corrode the silicon carbide reinforcement is selected to dissolve the sample. The reinforcements are collected and weighed, and the volume fraction of silicon carbide reinforcements is calculated according to the mass-to-volume conversion formula.
according to the method specified in GB/T 3850.
6.2.2 The density of silicon carbide reinforcement in aluminum matrix composites shall be measured according to the method specified in JB/T 11433.
6.3 Preparation of the ceramic crucible
6.3.1 Clean the ceramic crucible and place it in a Muffle furnace at 950 ??C until its weight is constant (the difference between the two weighings shall not exceed 0.3 mg). 6.3.2 Put the constant-weight ceramic crucible in a desiccator for later use. 6.4 Dissolution of the matrix
6.4.1 Weigh the sample according to Table 1 and place it in a polytetrafluoroethylene beaker, add 30 mL of hydrochloric acid solution (4.3), cover the beaker; after the violent reaction is over, slowly add the hydrofluoric acid (4.4) dropwise until it is completely dissolved.
6.4.2 Wash the beaker lid and beaker wall with water, and add hydrogen peroxide (4.5) dropwise until the solution is clear.
6.4.3 Thoroughly clean the walls of the beaker.
6.4.4 Heat the solution at a low temperature until it is boiling (with large bubbles), remove the beaker, and cool to room temperature.
6.5 Filtration and constant-weight keeping of reinforcement
6.5.1 Filter the precipitate with quantitative slow filter paper, thoroughly clean the beaker and filter the cleaning solution.
6.5.2 Clean the filter paper and sediment until there is no more acid residue, then transfer the filter paper and sediment together to a ceramic crucible with constant weight.
6.5.3 First incinerate it at 500 ??C, then burn at 900 ??C??50 ??C, take it out and cool it slightly; transfer it to a desiccator to cool, and weigh it until its weight is constant, the result is accurate to 0.0001 g.
7 Calculation of results
The volume fraction ??r of silicon carbide is calculated according to formula (1), and the calculation result is retained to three significant figures.

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