SIST EN ISO 4492:2018 PDF

Name: SIST EN ISO 4492:2018 — Metallic powders, excluding powders for hardmetals - Determination of dimensional changes associated with compacting and sintering (ISO 4492:2017)
SKU: SIST EN ISO 4492:2018
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Metallic powders, excluding powders for hardmetals - Determination of dimensional changes associated with compacting and sintering (ISO 4492:2017)

Название (английский):

SIST EN ISO 4492:2018

Metallic powders, excluding powders for hardmetals - Determination of dimensional changes associated with compacting and sintering (ISO 4492:2017)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 16
Дата публикации:: 4 января 2018 г.
Издание:: ISO 4492:2017
ICS:: 77.160

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Описание (английский):

ISO 4492 specifies a method by which the dimensional changes associated with compacting and sintering of metallic powders are compared with those of a reference powder when processed under similar conditions (see Clause 4). The method applies to the determination of three types of dimensional changes involved with the processing of metallic powders, excluding powders for hardmetals.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты SIST

Overview

EN ISO 4492:2017 (ISO 4492:2017) defines a standardized test method for comparing dimensional changes that occur during the compacting and sintering of metallic powders (excluding powders for hardmetals). The method compares a test powder with a reference powder processed under the same conditions and quantifies three types of dimensional change: spring back, sintered dimensional change, and total dimensional change. The standard is intended for use in powder metallurgy quality control, material development and specification.

Key topics and technical requirements

Purpose: Measure and report dimensional changes associated with compacting and sintering of metallic powders and compare them to a reference powder.

Three dimensional-change types:

Spring back (die → green): expansion after ejection from the die.
Sintered dimensional change (green → sintered): change due to sintering (can be positive or negative).
Total dimensional change (die → sintered): overall change from die cavity to final sintered part.

Test pieces and tooling: Standard tooling can produce cylindrical, rectangular or tensile test pieces (tensile tooling per ISO 2740). Tool geometry and tolerances are specified to ensure repeatability.

Apparatus & measurement:

Press capable of required compacting pressure/density.
Sintering furnace reproducing production time–temperature and atmosphere.
Scale (readable to 0.001 g) and micrometer (readable to 0.005 mm).

Procedure highlights:

Use at least three compacts from both test and reference powders processed under identical conditions.
Measure die, green compact and sintered compact dimensions to 0.005 mm.
Express dimensional changes as percentages calculated from the measurements; report average of at least three determinations, rounded to 0.01%.

Reference powder: Selected by agreement between supplier and user, closely matching composition and properties of the test powder.

Test report: Must include identification of test and reference powders, tooling and part dimensions, green density or compacting pressure, sintering conditions and results.

Applications and users

Who uses it: powder metallurgy laboratories, material suppliers, component manufacturers, quality control engineers, R&D teams developing sintered components.

Practical uses:

Specifying acceptable dimensional behaviour for new powder lots.
Validating production sintering cycles and tooling designs.
Comparing candidate powders for dimensional stability in sintered parts.
Supporting supplier–user agreements on dimensional tolerances and process control.

Related standards

ISO 2740 - referenced for tensile test-piece tooling (sintered metal materials, excluding hardmetals).

Other powder metallurgy and sintering standards may be relevant when defining material properties, mechanical testing and sampling procedures.

Keywords: metallic powders, powder metallurgy, compacting, sintering, dimensional changes, spring back, ISO 4492, EN ISO 4492, green compact, sintered dimensional change, total dimensional change.

SIST EN ISO 4492:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

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