• ASTM C1730-17

ASTM C1730-17

Standard Test Method for Particle Size Distribution of Advanced Ceramics by X-Ray Monitoring of Gravity Sedimentation

ASTM International , 07/01/2017

Publisher: ASTM

File Format: PDF

$28.00$56.00


1.1This test method covers the determination of particle size distribution of advanced ceramic powders. Experience has shown that this test method is satisfactory for the analysis of silicon carbide, silicon nitride, and zirconium oxide in the size range of 0.1 up to 50 µm.

1.1.1However, the relationship between size and sedimentation velocity used in this test method assumes that particles sediment within the laminar flow regime. It is generally accepted that particles sedimenting with a Reynolds number of 0.3 or less will do so under conditions of laminar flow with negligible error. Particle size distribution analysis for particles settling with a larger Reynolds number may be incorrect due to turbulent flow. Some materials covered by this test method may settle in water with a Reynolds number greater than 0.3 if large particles are present. The user of this test method should calculate the Reynolds number of the largest particle expected to be present in order to judge the quality of obtained results. Reynolds number (Re) can be calculated using the following equation:

where:
D = the diameter of the largest particle expected to be present, in cm,
ρ = the particle density, in g/cm³,
ρ0 = the suspending liquid density, in g/cm³,
g = the acceleration due to gravity, 981 cm/sec², and
η = the suspending liquid viscosity, in poise.

1.1.2A table of the largest particles that can be analyzed with a suggested maximum Reynolds number of 0.3 or less in water at 35°C is given for a number of materials in Table 1. A column of the Reynolds number calculated for a 50-µm particle sedimenting in the same liquid system is also given for each material. Larger particles can be analyzed in dispersing media with viscosities greater than that for water. Aqueous solutions of glycerine or sucrose have such higher viscosities.

Particle Composition

Particle Density

Maximum Particle Diameter, µm

Reynolds Number for 50 µmA

Aluminum Nitride

3.26

50.36

0.29

Aluminum Oxide

3.965

46.01

0.39

Cerium Dioxide

7.132

36.13

0.80

Silicon Carbide

3.217

50.68

0.29

Silicon Nitride

3.44

49.09

0.32

Yttrium Oxide

5.01

41.61

0.52

Zirconium Oxide

5.89

38.95

0.63

(A)A Reynolds number calculated for 50-µm particles sedimenting in water at 35°C, with a density of 0.9941 g/cm³ and viscosity of 0.7225 cp. Entries with Reynolds numbers that exceed the recommended upper limit of 0.30 are included to indicate that samples of these materials containing 50-µm particles should not be analyzed using water as a dispersing liquid without addition of a viscosity modifier such as glycerol or sucrose.

ASTM C1730-17 History

ASTM C1730-17(2022)

ASTM C1730-17(2022)

$24.00 $48.00

ASTM C1730-17

ASTM C1730-17

$28.00 $56.00

More ASTM Standards PDF

ASTM D4569-06(2017)

ASTM D4569-06(2017)

$28.00 $56.00

ASTM D6016-17

ASTM D6016-17

$30.00 $60.00

ASTM A582/A582M-12(2017)

ASTM A582/A582M-12(2017)

$28.00 $56.00

ASTM D6616-17

ASTM D6616-17

$33.00 $67.00