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| Platelet Calcined Alumina |
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A
A is the most widely known abrasive powder, popularly called
alundum. This product is made by melting bauxite in an electric
furnace at a temperature of 2000 to obtain aluminumoxide (Al2O3)
corundum crystal of at least 90% purity. One special feature
of this product is that the toughness (tenacity) of the abrasive
particles has been increased by fusing them with a small percentage
of titanium. As a result, A has the highest degree of toughness
among all Fujimi abrasive powders. This product, which is manufactured
to sustain a consistent distribution of particle sizes, is a
highly efficient abrasive and will not scratch the surface of
the workpiece, and maintains great stability as it functions
as an abrasive. A is well suited for use as a material in super-finishing
precision grindstones and super-finishing lapping cloth or paper.
It is the most suitable abrasive powder for use on cathode-ray
tubes and related glassware, and soft metals, where precision
lapping is required.
WA
WA is a fused white alumina abrasive powder. It is a product
with a wide variety of uses, and typical of the powders used
in precision processing. It is produced by crushing fused alumina
into a powder and then sorting the particles into a uniform
size. WA has an ฟ-type corundum crystal configuration. It is
a high-purity alumina, with at least a 96.0% pure Al2O3 composition.
It has a hardness next to that of silicon carbide (SiC), a closely
controlled particle size distribution, a consistent particle
shape, and has the potential to be used for high-level surface
processing. WA has superior qualities for use as a material
in super-finishing precision grindstones, super-finishing lapping
cloth or paper, and lapping tape for super-precision surface
finishing. It is also well suited for precision lapping of such
materials as metals, quartz crystal and semiconductors with
low tensile strength.
PWA
PWA is a high-quality alumina-type abrasive powder, consisting
of a plate-shaped crystal of Al2O3with
a purity of over 99.0%. It has excellent heat-resistant properties
as well as being chemically inert, and is not corroded by either
acids or alkalis. As the particle size distribution of PWA is
tightly controlled, it can produce a very fine lapped surface,
giving it superlative effectiveness as an abrasive. With a tremendous
range of utilizations, PWA is an abrasive powder capable of
performing a myriad of functions. In addition to being suitable
as a lapping agent for silicon, optical materials, liquid crystal,
stainless steel and other metals, PWA is also ideal for use
as a filler material for coatings, as a material for coating
lapping cloth or paper, and as a compounding agent combined
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GC
GC, green silicon carbide, is a very high purity SiC lapping powder. The hexagonal ฟ-type crystal is just below diamond in terms of hardness, and its chemical stability is excellent at room temperature. The result is a product with superior lapping and polishing capabilities, which is not affected by chemicals, and can spontaneously generate sharp grinding edges through fragmentation. GC is well suited for use as a lapping powder in a wide range of functions, including the precision lapping and dicing of crystal and ferrite, the slicing of Si ingots, and the processing of materials ranging from ultra- hard metals and edged tools to soft metals such as brass and other copper alloys. Additionally, GC is used in the processing of various resins. GC is also ideal for use in super-finishing precision grindstones. As it possesses the electricalproperties of a semiconductor, GC has good heat conductivity and has the ability to withstand high temperatures, making it useful as a material in fine ceramics.
C
C is a black silicon carbide lapping powder, commonly known as carborundum. Like GC, this product is obtained by fusing silica and coke in an electric furnace at a temperature of more than 2000, resulting in a product with an ฟ-type silicon carbide crystal configuration. Although in comparison with GC, C is slightly lower in purity and hardness, it does have excellent toughness. C is manufactured using Fujimi's own unique production methods. Becauseof its stable cutting edges and its ideal particle size distribution, it is used for abrasive machining. The unique abrasive character of C makes it possible for superior lapping to be done on a work surface. C is ideal for use as a material for precision lapping polishing cloths and papers, and finishing precision grindstones. In addition, it can also be used for precision lapping of cast iron, brass, copper, aluminum, stone, and glass for photomasks. It is also well suited for the precision honing and dicing process necessary for such products as semiconductor crystals.
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