Dehydrator
Domestic dehydrator is
used to preserve different types of fruits, vegetables, meats etc to maintain
the supply of fresh products. These contain safe heating elements such Nichrome wire mesh heating elements with equal total wattage. The drying trays are made
with metal mesh such as aluminium mesh for use as trays.
Powder sintering
Selective inhibition
of sintering is essentially based on preventing the selected powder particles
from sintering. Each layer development includes four steps:
a.
Laying
thin powder layer: It is performed by a roller that sweeps a horizontal surface
nominally above the earlier layer and takes the powder material in the front
while moving in a way that its front surface creates an upward motion.
b.
Accumulation
of sintering inhibitor- This step by using raster printing by a standard
multiple nozzle inkjet or vector
printing with a single printing nozzle with fine orifice, sintering preventor
liquid is accumulated on the chosen regions of each layer.
c.
Reducing
radiation frame- It is used for transformation of powder material by reflective
plates that show the essential part of every layer to radiation. Without these
plates, the whole powder base is sintered.
An alternative to use
masking plates is use of a passing heating bar, a radiation panel that is made
from a relatively small count of discrete heating elements such as nichrome mesh that can be
activated like a chosen region of the powdered layer is sintered.
Another method is
sintering by a heater that is adequate to scan the needed areas of every layer with
a good small and is adequate to reduce wide powder sintering.
Alternative
Sintering: An alternative to
sintering every layer is bulk sintering where no sintering is conducted after
inhibitor use to every layer and as soon as the entire layers are processed
with inhibitor liquid, the whole powder magnitude is sent to a sintering oven.
Benefits of
Sintering
1.
SIS is an
economical process as heating element is used. The process is quick as the
whole layer is sintered simultaneously. The liming factor in speed is the
inhibitor deposition process that nowadays can be performed by multi-jet print
heads at good speed.
2.
The size
accuracy and surface quality of the fabricated components is superior to the
SLS.
It
needs less inhibitor liquid to prevent sintering.
3.
Multi-color
components can be developed by using the proposed process.
Many liquids that
fully prevented sintering were analyzed for compatibility with heat and piezo
pump
The inhibition process
has a significant role in sintering. The process control is needed to develop
extractable components with fine geometric factors.
SIS is a supreme
technique to fabricate precise and dense metallic components. Different
chemical inhibitors and mechanical inhibitors are used for different types of
metals including super alloys. The technique depends on bulk sintering of the
processed powder volume. The use of this method in manufacturing components has
given rise to several studies and its future use in the industries.
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