ISO DIS 21814

Description / Abstract: This International Standard specifies the methods for the chemical analyses of fine aluminum nitride powders used as the raw material for fine ceramics.

This draft stipulates the analyses methods of aluminum, total nitrogen, boron, calcium, copper, iron, magnesium, manganese, molybdenum, nickel, potassium, silicon, sodium, titanium, tungsten, vanadium, zinc, zirconium, carbon, chlorine, fluorine, and oxygen in aluminum nitride powders for fine ceramics. Aluminum is determined by using either an acid pressure decomposition–CyDTA–zinc back titration method or an acid digestion–inductively coupled plasma–optical emission spectrometry (ICP–OES) method. Total nitrogen is determined by using an acid pressure decomposition–distillation separation– acidimetric titration method, a direct decomposition–distillation separation–acidimetric titration method, or an inert gas fusion–thermal conductivity method. Boron, calcium, copper, iron, magnesium, manganese, molybdenum, nickel, potassium, silicon, sodium, titanium, tungsten, vanadium and zinc are determined by using an acid digestion–ICP–OES method, or an acid pressure decomposition–ICP–OES method. Sodium and potassium are also determined by using either an acid pressure decomposition– flame emission method or an acid pressure decomposition–atomic absorption spectrometry method. Oxygen is determined by using an inert gas fusion–IR absorption spectrometry method. Carbon is determined by using a combustion–IR absorption spectrometry method, or a combustion– conductometry method. Chlorine and fluorine are determined by using a pyrohydrolysation method followed by ion chromatography or spectrophotometry