Chapter 3: Metallurgy and Assembly Flashcards
All of these are important properties and characteristics of powder except : -Particle size -Chemistry and purity -Size distribution -Viscosity
Viscosity
_______ is a process in which
molten metals are broken into small drops
of liquid by high-speed fluids (gas as air or
inert gas; liquid as water) or fluids with
centrifugal force, and then solidified into
powder.
Atomization
_______ is the name given to the
process by which fine powdered materials
are blended, pressed into a desired shape,
and then heated to bond surface.
Powder Metallurgy
Precleaned & preloaded with brazing metal and heated in a furnace. -Torch Brazing -Diffusion Brazing -Furnace brazing -Infrared Brazing
Furnace brazing
\_\_\_\_\_\_\_ is a fastening operation in which a stitching machine is used to form the U-shaped stitches one at a time from steel wire and immediately drive them through the two parts to be joined.
Stitching
It is an unthreaded, headed pin used to join
two (or more) parts by passing the pin
through holes in the parts and then forming
(upsetting) a second head in the pin on the
opposite side
-bolt
-stud
-screw
-rivet
rivet
It is a mechanized technique in which a
rotating roller is partially submersed in a pan
of liquid adhesive and picks up a coating of
the adhesive, which is then transferred to the
work surface
-Manual rollers
-Roll coating
-spraying
-automatic applicators
Roll coating
It is the measure of a powder’s ability to fill
available space without external pressure
Select the correct response:
-Apparent density
-Green strength
-Flow rate
-Compressibility
Apparent density
It is where the edges of two separate sheet- metal parts or the opposite edges of the same part are bent over to form the fastening seam Select the correct response: -dimpling -embossed protrusions -seaming -lanced tabs
seaming
In this process, it combines powder compaction and sintering into a single operation Select the correct response: -isothermal compaction -Hot-isostatic pressing -Isostatic compacting
Hot-isostatic pressing
Stage of sintering where it combusts any air and removes lubricants or binders that would interfere with good bonding Select the correct response: -purge -burn out -high temperature -cooling period
purge
_____ is a process in which the
edges of one part are deformed over a
mating component, is another example of
integral assembly.
Crimping
Stage in sintering process where it lowers the temperature of the products in a controlled atmosphere Select the correct response: -high temperature -purge -cooling period -burn out
cooling period
It is the effectiveness of applied pressure Select the correct response: -Green strength -Compressibility -flow rate -Apparent density
Compressibility
Popular approach to attaching circuits to circuit boards
- resistance soldering
- ultrasonic soldering
- reflow soldering
- wave soldering
wave soldering
It is internally threaded fastener having standard threads that match those on bolts of the same diameter, pitch, and thread form Select the correct response: -filler -bolt -screw -nut
nut
Type of adhesive which include a variety of thermoplastic and thermosetting polymers Select the correct response: -None of these -Inorganic adhesives -Synthetic adhesives -Natural adhesives
Synthetic adhesives
The following are methods in powder manufacturing except:
Select the correct response:
-Evaporation powders
-Chemical reduction of particulate compounds
-Preminit Precipitation from solution
- Electrolytic deposition
evaporation powders
The method involves the use of a long thread or cord interwoven with the parts so as to produce a continuous seam between them. Select the correct response -stitching -rivet -stapling -sewing
sewing
It is prepared like fusion welding and filler metal is deposited at the joint with the use of an oxyacetylene torch Select the correct response. -torch brazing -none of these -induction brazing -braze welding
braze welding
In sintering process, all stages must be conducted in oxygenated conditions
Select the correct response:
-True
-False
False
The following are fastening methods except: Select the correct response. -Snap-in Fasteners -Crimping -Soldering -Stapling
Soldering
It is used to describe the strength of the pressed powder after compacting Select the correct response: -Apparent density -Flow rate -Green strength -Compressibility
Green strength
In this process, the pressed-powder compacts are heated in a controlled atmosphere to right below the melting point Select the correct response. -blending -compacting -mixing -sintering
sintering
Metal powders can flow like liquid
Select the correct response.
-True
-False
False
The powder metallurgy has basic steps Select the correct response. -6 -5 -4 -3
4
A heated preform is surrounded by hot granular material, transmitting uniform pressure
Select the correct response:
-High-temperature metal deformation process
-Spray forming
-Ceracon process
-None of these
Ceracon process
It is compacted and densified into a shape, known as green compact Select the correct response: -granulated powder -loose powder -thick powder -compact powder
Loose powder
Most powder metallurgy products are ready to use after the sintering process
Select the correct response:
True
False
True
It uses manually operated pressure-fed flow guns, has more consistent control than brushing. Select the correct response -Flowing -Brushing -Manual rollers -Silk screening
Flowing
It measures the ease with which powder can be fed and distributed into a die Select the correct response: -Compressibility -Flow rate -Apparent density -Green strength
Flow rate
In adhesive bonding, the parts being joined are called _____
adherends
Compacting comes before mixing or blending process
Select the correct response:
True
False
False
Type of flux that cleans the surface rapidly Select the correct response: -Tin-lead -Noncorrosive resin -Lead silver -Inorganic acids
Inorganic acids
Blending or mixing operations can be done either wet or dry
- True
- False
True
