GB/T 6524-2003 English PDF

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GB/T 6524-2003: Metallic powders -- Determination of particle size distribution by gravitational sedimentation in a liquid and attenuation measurement
Status: Valid

GB/T 6524: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6524-2003	294	Add to Cart	3 days	Metallic powders -- Determination of particle size distribution by gravitational sedimentation in a liquid and attenuation measurement	Valid
GB/T 6524-1986	279	Add to Cart	3 days	Determination of particle size distribution of metallic powders by method of photosedimentation	Obsolete

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Basic data

Standard ID: GB/T 6524-2003 (GB/T6524-2003)
Description (Translated English): Metallic powders-Determination of particle size distribution by gravitational sedimentation in a liquid and attenuation measurement
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H21
Classification of International Standard: 77.040.30
Word Count Estimation: 13,138
Date of Issue: 2003-11-03
Date of Implementation: 2004-05-01
Older Standard (superseded by this standard): GB/T 6524-1986
Adopted Standard: ISO 10076-1991; IDT
Regulation (derived from): Chinese national standard approved by the announcement in 2003 No. 14 (No. 62 overall)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China
Summary: This standard specifies: metal powder in suspension when settling due to gravity by measuring the beam passes through suspension the amount of attenuation to calculate the particle size distribution methods. This standard applies to: satisfy Stokes equations the situation, namely Reynolds number is less than 0. 25-laminar flow conditions, while not Brownian motion particle settling velocity impact. This standard applies to: All 1��m ~ 100��m particle sizes in between including carbide powder metal powder. However, this method does not apply to the following conditions: a) isometric particle shape deviates too far from the body metal powders, such as flakes, fibrous and other complex shapes metal powders, b) mixed powder, c) contains a lubricant or bonding agent powder, d) can not be dispersed in a liquid powder. Sedimentation method exists to measure particle size upper and lower limits (see 5. 1). If the sample the largest particles beyond the scope of this, the liquid the viscosity should be increased to meet the requirements so far, generally, powder in liquid initially when the concentration is less than 0. 5% (volume fraction) Stokes' law is valid -. In some cases, when the concentration is greater than 1% (volume fraction) can still get the right the result, but for each material to be tested for validity.

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