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
GB/T 41737-2022 English name.Aluminum matrix composites - Test method for volume fraction of SiC - Dissolution method
ICS 77.040.99
CCSY80
National Standards of People's Republic of China
Aluminum Matrix Composite
Silicon carbide volume fraction test method dissolution method
State Administration for Market Regulation
Released by the National Standardization Management Committee
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"
drafting.
Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.
This document is under the jurisdiction of the National Carbon Fiber Standardization Technical Committee (SAC/TC572).
This document is drafted by. Jiangsu Product Quality Supervision and Inspection Research Institute, China Aluminum Materials Application Research Institute Co., Ltd.
The main drafters of this document. Zhu Xiaolin, Wang Yan, Zhu Yuhong, Yao Qiang, Yang Dongmei, Lu Tong.
Aluminum Matrix Composite
Silicon carbide volume fraction test method dissolution method
1 Scope
This document describes the determination of the volume fraction of silicon carbide particles, whiskers and fibers in aluminum matrix composites reinforced with silicon carbide
The principle of the method, reagents, instruments and equipment, analysis steps, result calculation method and test report.
This document is applicable to particle reinforcement with a reinforcement particle size greater than 3 μm or whisker and fiber reinforced aluminum matrix composites with a diameter greater than 3 μm
Determination of the volume fraction of silicon carbide particles, whiskers and fibers in the material.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document.
Preparation of preparations and products used in GB/T 603 test methods for chemical reagents
GB/T 3850 Density Determination Method for Dense Sintered Metal Materials and Cemented Carbide
GB/T 6682 Analytical laboratory water specifications and test methods
JB/T 11433 Determination of Ordinary Abrasive Density
3 Principles of the method
Choose an acidic solvent that can dissolve the aluminum matrix but not corrode the silicon carbide reinforcement to dissolve the sample. Collect reinforcements and weigh them, according to mass
Calculate the volume fraction of SiC reinforcement using the volume conversion formula.
4 reagents
4.1 Unless otherwise specified, the reagents used in this document should be of analytical purity (including analytical purity) or above. The preparations and products used should be in accordance with GB/T 603
prescribed preparation. The water used for analysis shall comply with the specifications above for third-grade water (including third-grade water) in GB/T 6682.
4.2 Hydrochloric acid, analytically pure.
4.3 Hydrochloric acid solution, 20% (mass fraction).
4.4 Hydrofluoric acid, analytically pure.
4.5 Hydrogen peroxide, analytically pure.
5 Instruments and equipment
5.1 Teflon beaker.
5.2 Balance, the division value is 0.0001g.
5.3 Quantitative slow filter paper.
5.4 Ceramic crucible, 40mL.
5.5 muffle furnace.
6 Analysis steps
6.1 Sample
Cut the sample from the ingot of silicon carbide reinforced aluminum matrix composite material, and process the sample into chips with any size not greater than 1mm.
The part should be 3mm below the original surface of the ingot. See Table 1 for the weighing quality of the sample, accurate to 0.0001g.
6.2 Determination of density
6.2.1 The density of the aluminum matrix composite material sample shall be measured 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 ceramic crucibles
6.3.1 Clean the ceramic crucible and place it in a muffle furnace at 950°C for constant weight (the difference between the two times should not exceed 0.3mg).
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 30mL of hydrochloric acid solution (4.2), cover the cup, and wait until the violent reaction ends.
Beam, slowly drop hydrofluoric acid (4.3) until completely dissolved.
6.4.2 Wash the beaker lid and beaker wall with water, and add hydrogen peroxide (4.4) dropwise until the solution is clear.
6.4.3 Thoroughly clean the walls of the beaker.
6.4.4 Heat at low temperature until boiling (with large bubbles), remove the beaker, and cool to room temperature.
6.5 Filtration and constant weight of reinforcement
6.5.1 Filter the precipitate with quantitative slow-speed filter paper, wash the beaker thoroughly 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 at 500°C, then burn at 900°C±50°C, take it out and cool it slightly, transfer it to a desiccator to cool, weigh until constant weight, and the result is fine
Accurate to 0.0001g.
8 Test report
Unless otherwise agreed by both parties, the test report shall at least include the following information.
a) Material name, grade, specification;
b) Sample number, quantity, sampling location;
c) the number of the document;
d) test results and their presentation;
e) date of report and report number;
f) Names of inspectors and auditors.