Overview
SIST EN 27627-2:2000, aligned with ISO 7627-2:1983, defines a standardized method for the chemical analysis of hardmetals through flame atomic absorption spectrometry (FAAS). This part of the standard focuses specifically on the quantitative determination of trace amounts of calcium, potassium, magnesium, and sodium within a concentration range from 0.001% to 0.02% (m/m). Given the low concentration levels involved, this standard highlights the critical precision and care needed in sample preparation, analysis, and reporting.
The standard is essential for industries dealing with powder metallurgy and hardmetal manufacturing, ensuring reliable and reproducible measurement of these elements, which can influence material properties and performance.
Key Topics
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Scope and Field of Application
Covers determination of Ca, K, Mg, and Na in hardmetals using FAAS, within specified low concentration ranges. It supplements the general requirements provided by ISO 7627-1, with emphasis on avoiding contamination during analysis.
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Sample Preparation and Reagents
Utilizes careful dissolution of approximately 1g test portions in controlled volumes of hydrofluoric and nitric acids, with additions of ammonium fluoride and cesium chloride to complex interfering ions. High-purity reagents and decontaminated equipment are critical.
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Flame Atomic Absorption Spectrometry Setup
Specifies instrumental parameters including optimal wavelengths for each element, oxidants, and sensitivity ranges. Calibration employs matrix-matched solutions and stock standards to ensure accuracy.
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Calibration and Measurement Procedure
Multiple calibration solutions with known concentrations are prepared alongside blank samples. Absorbance measurements are taken systematically, with at least two replicates per solution to guarantee reliability.
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Calculation and Reporting of Results
Element concentration is expressed as a mass percentage using a defined formula incorporating measured absorbance, dilution volume, and sample mass. Permissible deviations in repeated measurements enhance confidence in results.
Applications
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Quality Control in Hardmetal Production
Precise determination of Ca, K, Mg, and Na helps control impurities that may affect sintering, hardness, or corrosion resistance of tungsten carbide and cobalt-based hardmetals.
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Powder Metallurgy Research and Development
Enables detailed chemical profiling of powder blends to optimize compositions and improve mechanical properties.
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Environmental and Process Monitoring
Quantitative monitoring of alkali and alkaline earth metals that can influence equipment wear or powder behaviors during manufacturing.
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Standardized Reporting in Commercial and Regulatory Contexts
Provides a consistent framework for international laboratories and manufacturing plants to produce comparable and legally defensible analytical data.
Related Standards
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ISO 7627-1: General Requirements in FAAS for Hardmetals
Establishes the foundational principles, apparatus specifications, and sampling procedures for atomic absorption analysis in hardmetals.
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Other Hardmetal Analytical Standards
Covering different elements, alternative spectrometric methods, or complementary techniques like inductively coupled plasma (ICP).
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Standards on Sampling and Sample Preparation
Ensuring representative sample collection and preparation aligned with metallurgical quality assurance.
By adhering to SIST EN 27627-2:2000, laboratories ensure accurate, reproducible, and contamination-free analyses of trace metallic elements in hardmetals, fostering better product quality, process control, and compliance with international manufacturing standards. This contributes significantly to advancing the powder metallurgy and hardmetal industries globally.
