GB/T 41737-2022Aluminum matrix composites-Test method for volume fraction of SiC-Dissolution method (English PDF)
铝基复合材料 碳化硅体积分数试验方法 溶解法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 14, 2022
Implementation date
February 1, 2023
Scope
GB/T 41737-2022 is the English-translated version of 铝基复合材料 碳化硅体积分数试验方法 溶解法.
GB/T 41737-2022 describes the dissolution method for determining the volume fraction of silicon carbide in aluminium matrix composites reinforced with silicon carbide particles, whiskers or fibres.
An acidic solvent that dissolves the aluminium matrix without attacking the reinforcement is used on the sample; the reinforcement is then collected and weighed, and its volume fraction worked out from a mass-to-volume conversion.
The document covers the principle of the method, the reagents, the instruments, the analysis steps, the calculation of results and the test report.
Densities are measured to GB/T 3850 and JB/T 11433, crucibles brought to constant weight at 950 °C, and the residue incinerated at 500 °C and then at 900 °C ± 50 °C. It applies where the reinforcement size exceeds 3 µm. It was issued on 14 October 2022 and has applied since 1 February 2023.
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Document preview — GB/T 41737-2022
National Standard of the People's Republic of China
- ICS
- 77.040.99
- Classification
- Y 80
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Principles of the method4
- 4 Reagents5
- 5 Instruments and equipment5
- 6 Analysis steps5
- 7 Calculation of results6
- 8 Test report7
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 µm or whisker and fiber reinforced aluminum matrix composites with a diameter greater than 3 µm.
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.
6 Analysis steps
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 phir of silicon carbide is calculated according to formula (1), and the calculation result is retained to three significant figures. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 603Chemical reagent - Preparations of reagent solutions for use in test methods
- GB/T 3850Impermeable sintered metal materials and hard metals -- Determination of density
- GB/T 6682Water for analytical laboratory use - Specification and test methods
- JB/T 11433Abrasive - Method for determination of density
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