Browse Prior Art Database

Carbon Fiber Reinforced Metal Matrix or Polymer Composite E-block

IP.com Disclosure Number: IPCOM000123968D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 1 page(s) / 65K

Publishing Venue

IBM

Related People

Prater, W: AUTHOR [+3]

Abstract

This disclosure describes a means to manufacture an actuator E-block, or other disk drive components, of a carbon fiber reinforced metal matrix composite. Graphite fiber has a modulus of 370 to 830 GPa which is 5 to 12 times stiffer than aluminum. Because graphite fiber is at most 75% the density of aluminum it can be used to make a composite comb structure with a very attractive seek time (inertia) and bandwidth (stiffness).

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Carbon Fiber Reinforced Metal Matrix or Polymer Composite E-block

This disclosure describes a means to manufacture an
actuator E-block, or other disk drive components, of a carbon fiber
reinforced metal matrix composite.  Graphite fiber has a modulus of
370 to 830 GPa which is 5 to 12 times stiffer than aluminum.  Because
graphite fiber is at most 75% the density of aluminum it can be used
to make a composite comb structure with a very attractive seek time
(inertia) and bandwidth (stiffness).

   A specific example is given how to manufacture an
actuator E-block of a carbon fiber reinforced metal matrix
composite.  First, carbon fibers are chemical vapor deposition
coated with boron and then with titanium to make their surface
readily wetted by and to prevent the fibers from chemically reacting
with the molten aluminum.  Next, the fiber is woven into sheets which
are then layered to form fabric mats.  Then, under an inert
atmosphere molten aluminum can be pressure infusion cast or capillary
wicked into the fabric.  Simple actuator components such as arms,
spacers, and coil yoke can be cut to shape from the MMC mats.  In an
alternate construction method the fabric mats can be cut to shape and
placed in the casting mold where they are infused with the molten
aluminum to make arms, spacers and coil yokes.  Finally, the parts
are stacked in an E-block mold and heated to reflow the metal fusing
it into one solid E-block.

   A second method is to wind the carbon fibers...