Quality Assurance

Question 1

What are the two major objectives in Quality Assurance?

Answer 1

• Maintain the process under control to maintain maximum yield and
quality

• Reject the unacceptable and retain good components

Question 2

What is the process for Quality Assurance?

Answer 2

• Starts with procurement of raw materials

• Continues through fabrication process
• Attention shifted to shape-forming and
densification steps
• Final testing

Question 3

Material Specification

Answer 3

a set of documented requirements to

be satisfied by a material.

Question 4

Scanning Electron Microscope (SEM)

Answer 4

“electron microscope that produces images of a sample by

scanning the surface with a focused beam of electrons” wiki

Question 5

X-Ray Diffraction

Answer 5

Collimated beam strikes the crystals and scatters mostly
causing destructive interference except for some directions that
result in constructive interference

Used to determine crystal structure

Question 6

Chemical Analysis

Answer 6

• SEM - EDS Analysis

* X-Ray Diffraction

Question 7

Particle size distribution

Answer 7

ASTM B214:Standard Test Method for Sieve Analysis of Metal Powders

“1.1 This test method covers the dry sieve analysis of metal powders, using sieves with openings ranging from 45 to 850 micrometers.“

Question 8

Apparent Density

Answer 8

ASTM B212: Standard Test Method for Apparent Density of Free-Flowing Metal Powders Using the Hall Flowmeter Funnel

“1.1 This test method describes a procedure for determining the apparent density of free-flowing metal powders, and mixed powders; and is suitable for only those powders that will flow unaided through the specified Hall Flowmeter funnel.”

Question 9

Flow Rate

Answer 9

ASTM B213: Standard Test Methods for Flow Rate of Metal Powders Using the Hall Flowmeter Funnel

“1.1 This test method covers the determination of a flow rate, by the use of the Hall Flowmeter funnel of metal powders and powder mixtures. It is suitable only for those powders that will
flow unaided through the Hall Flowmeter funnel”

Question 10

Tap Density

Answer 10

ASTM B527: Standard Test Method for Tap Density of Metal Powders and Compounds

“1.1 This test method covers the evaluation of the tap density physical characteristic of metal powders and related compounds. The degree of correlation between the results of this test method
and the quality of powders in use will vary with each particular application and has not been fully determined.”

Question 11

Dry penetration

Answer 11

Used primarily for the

detection of surface flaws.

Question 12

Shape Forming

Answer 12

• Visual & Dimensional
     • Laser or Tactile 
       Scanning
• Radiography
     • Conventional X-ray
     • Microfocus X-ray
• Green density

Question 13

What are some ways to detect densification?

Answer 13

• Visual & Dimensional
• Laser or Tactile
Scanning

• Nondestructive Inspection
  * Dye Penetration
  * Conventional X-ray
  * Microfocus X-ray
• Bulk density
• Microstructural Analysis