Design Guide

MIM Overview

Standards

The standards used in MIM usually start at the national level, say in Japan or the USA, and then become adopted in the powder community, and spread to national bodies, eventually becoming part of the ISO standards. For North America, the example would be the MPIF or Metal Powder Industries Federation as the regional trade organization, which then feeds its standards into the ASTM or American Society for Testing Materials, which participates in the ISO or International Standards Organization global standards. The standards are reviewed and updated periodically, and expanded to handle new alloys, processing options, or test parameters. Listed below are some of the ones seen in MIM.

Testing Powders

Analysis by Microscopical Methods for Particle Size Distribution of Particulate Substances of Subsieve Size - ASTM E20
Apparent Density of Non-Free Flowing Metal Powders Using the Hall Apparatus - MPIF 04,
ASTM B212, ISO 3923/1
Apparent Density of Non-Free Flowing Metal Powders Using the Carney Apparatus - MPIF 28,
ASTM B417, ISO 3923/1
Apparent Density of Metal Powders Using the Arnold Meter - MPIF 48, ASTM B703
Apparent Density of Refractory Metals and Compounds by Scott Volumeter - ASTM B329 Average Particle Size of Metal Powders Using the Fisher Subsieve Sizer - MPIF 32, ASTM
B330, ASTM C72 (see also ISO 10070)
Flow Rate of Free-Flowing Metal Powders Using the Hall Apparatus - MPIF 03, ASTM B213,
ISO 4490
Oil Absorption of Pigments by Spatula Rub-out - ASTM D281
Particle Size Distribution of Metal Powders and Related Compounds by Light Scattering - ASTM B822
Particle Size Distribution of Refractory Metals and Compounds by X-ray Monitoring of Gravity Sedimentation - ASTM B761
Particle Size Distribution of Tungsten Metal Powder by Turbidimetry - ASTM B430 Sampling Finished Lots of Metal Powders - MPIF 01, ASTM B215, ISO 3954
Tap Density of Metal Powders - MPIF 46, ASTM B527, ISO 3953

Testing of Sintered Products

Carburized Case Hardness and Case Depth of Sintered Parts - MPIF 37, ISO 4507 Density Determination of MIM Components (Gas Pycnometry)- MPIF 63
Determination of Charpy Impact Energy of Unnotched Metal Injection Molded Test Specimens - MPIF 59
Determination of Corrosion Resistance of MIM Grades of Stainless Steel Immersed in 2% Sulfuric Acid Solution - MPIF 62
Green Strength of Compacted Metal Powder Specimens - MPIF 15, ASTM B312, ISO 3995 Impact Strength of Sintered Metal Powder Specimens - MPIF 40, ISO 5754
Material Standards for Metal Injection Molded Parts - MPIF 35 Nickel-Iron Powder Metallurgy Soft Magnetic Alloys - ASTM A904
Nickel-Silver Sintered Metal Powder Structural Parts - ASTM B458 Sintered Austenitic Stainless Steel Structural Parts - ASTM B525
Sintered Metal Materials and Hardmetals Determination of Young's Modulus - ASTM E111, ISO 3312
Sintered Metal Materials, Excluding Hardmetals, Determination of Transverse Rupture Strength ISO 3928
Soft Magnetic Iron Fabricated by Powder Metallurgy - ASTM A811
Standard Specification for Metal Injection Molding (MIM) Ferrous Parts - ASTM 883
Standard Test Method for Linear Thermal Expansion of Solid Materials with a Push-Rod Dilatometer - ASTM E228
Transverse Rupture Strength of Sintered Metal Powder Test Specimens - MPIF 41, ASTM B528, ISO 3325