ISO 3907:2009 PDF

Hardmetals — Determination of total carbon — Gravimetric method

Название (английский):

ISO 3907:2009

Hardmetals — Determination of total carbon — Gravimetric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 29 сентября 2009 г.
Издание:: ISO IS 3907 edition 3 version 1
ICS:: 77.160

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Описание (английский):

ISO 3907:2009 specifies a gravimetric method for the determination of the mass fraction of total carbon in carbides and hardmetals. This method is applicable to carbides of chromium, hafnium, molybdenum, niobium, tantalum, titanium, vanadium, tungsten and zirconium, mixtures of these carbides and binder metals, free of lubricant, all grade of presintered or sintered hardmetals, produced from these carbides, and having a mass fraction of total carbon exceeding 4 %.

Технические детали

Технический комитет: ISO/TC 119/SC 4 - Sampling and testing methods for hardmetals
SKU: ISO 3907:2009

Abstract

Overview

ISO 3907:2009 - Hardmetals: Determination of total carbon - Gravimetric method specifies a gravimetric laboratory procedure for measuring the total carbon content of carbides and hardmetals. The method applies to carbides of chromium, hafnium, molybdenum, niobium, tantalum, titanium, vanadium, tungsten and zirconium, their mixtures with binder metals, and presintered or sintered hardmetals with a total carbon mass fraction greater than 4%.

Key topics and requirements

Principle: Oxidize carbon to CO2 at high temperature in a pure oxygen stream; absorb CO2 on ascarite and determine mass increase gravimetrically.
Apparatus:
- Electric furnace with combustion tube (operation up to 1 350 °C).
- Combustion tube (18–30 mm ID, ≥650 mm length) and refractory boat pretreated in oxygen.
- Absorption bulbs containing ascarite and a drying layer of anhydrous magnesium perchlorate.
- Oxygen supply with carbon-containing impurities ≤ 0.6 ml C/m3.
- Hook (heat-resistant wire) with carbon content

Overview

Key topics and requirements

Principle: Oxidize carbon to CO2 at high temperature in a pure oxygen stream; absorb CO2 on ascarite and determine mass increase gravimetrically.
Apparatus:
- Electric furnace with combustion tube (operation up to 1 350 °C).
- Combustion tube (18–30 mm ID, ≥650 mm length) and refractory boat pretreated in oxygen.
- Absorption bulbs containing ascarite and a drying layer of anhydrous magnesium perchlorate.
- Oxygen supply with carbon-containing impurities ≤ 0.6 ml C/m3.
- Hook (heat-resistant wire) with carbon content

ISO 3907:2009 PDF

Технические детали

Abstract

Overview

Key topics and requirements

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Abstract

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