The ASTM C1730 standard is helpful for both the producer and user of ceramic powders. Manufacturers rely on the validity of ASTM C1730 test (Standard Test Method for Particle Size Distribution of Advanced Ceramics by X-Ray Monitoring of Gravity Sedimentation) data for its use in specification preparation or predicting the quality of the materials examined. The test standards can be applied to other ceramic materials based on their property of X-ray absorption.
ASTM C1730 Nanoparticles of Ceramics Using X-Ray Gravity Sedimentation
What is ASTM C1730?
ASTM C1730 Sample Preparation Guide
In the ASTM C1730 test, silicon nitride powder with a determined median diameter of 1.0 m is used, and silicon carbide with a mass of 5g per 100 mL of dispersing medium is used.
What are the Test Procedure and requirements for ASTM C1730?
In the ASTM C1730 standard method, a thoroughly dispersed homogeneous suspension of the ceramic powder is allowed to settle in a cell scanned by a collimated X-ray beam of constant intensity. The net X-ray signal is inversely proportional to the sample concentration in the dispersing medium, and the diameter of the particle is related to the point of the X-ray beam relative to the top of the cell. Cumulative mass percent versus equivalent spherical diameter is recorded to yield the particle size distribution curve.
Analysis Results and Interpretation
The ASTM C1730 test is useful for determining the particle distribution of ceramic materials by monitoring sedimentation under gravity. The test standard works on the Reynolds number (Re) that is given by:
Re = D3 (ρ – ρo) ρo g / 18 η2
Since:
D = the diameter of the largest particle in cm.
ρ = the particle density.
ρ0 = the suspending liquid density.
g = the acceleration due to gravity.
η = the suspending liquid viscosity.
The ASTM C1730 standard specifies the measurement of particle size distribution in ceramic powders.
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