SAMPE Journal - May/June 2023 - 17
INTRODUCTION
Laser chemical vapor deposition (LCVD) is a
novel, innovative technique for the fabrication
and production of high purity, strong, crystalline
ceramic silicon carbide (SiC) fibers. This process
yields unheralded control over the fiber properties,
such as length, diameter, and stoichiometry,
which makes these fibers uniquely tailored for
high temperature applications. Commercially
developed at Free Form Fibers (FFF), LCVD- based
SiC fibers are being utilized in ongoing work to
demonstrate the capability of this high purity
reinforcement phase in ceramic matrix composites
(CMC) in high temperature, extreme environment,
or ultra-high temperature applications. Ceramic
fibers can be incorporated into composite
materials, where they are wound or woven into
three dimensional shapes. These fiber structures
are coated with an interphase and infiltrated with a
matrix to form a ceramic matrix composite, which
exhibits strength and toughness that far exceeds
the base ceramic matrix.
The LCVD technology produces
high quality, high purity
fibers by an approach that differs
from other chemical vapor
deposition-based techniques
by the use of a focused laser
beam, with a spot size on the
order of 20 microns. The input
beam delivers the energy required
to drive the gas phase
reaction that breaks down the
selected gas precursors and
yields a solid product. By pulling
the starting substrate or
the laser beam at a rate that
sustains the gas phase chemical
reaction, a fiber format of
solid material is formed. The
pull rate of the substrate/laser
matches the deposition rate of
the material onto the formed
fiber, making LCVD analogous
to
additive
manufacturing.
One of the most important
technical advances over the
last 15+ years is the parallelization
of the laser beam
input, allowing for multiple
beams to simultaneously produce
fibers in a parallel array
manner. A representation of
this laser array design is found
in Figure 1. An important difwww.
sampe.org
Figure 1. Parallelized LCVD process using multiplexed laser beam array.
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MAY JUNE 2023
|
SAMPE JOURNAL |
17
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SAMPE Journal - May/June 2023
Table of Contents for the Digital Edition of SAMPE Journal - May/June 2023
Contents
SAMPE Journal - May/June 2023 - Cover1
SAMPE Journal - May/June 2023 - Cover2
SAMPE Journal - May/June 2023 - Contents
SAMPE Journal - May/June 2023 - 2
SAMPE Journal - May/June 2023 - 3
SAMPE Journal - May/June 2023 - 4
SAMPE Journal - May/June 2023 - 5
SAMPE Journal - May/June 2023 - 6
SAMPE Journal - May/June 2023 - 7
SAMPE Journal - May/June 2023 - 8
SAMPE Journal - May/June 2023 - 9
SAMPE Journal - May/June 2023 - 10
SAMPE Journal - May/June 2023 - 11
SAMPE Journal - May/June 2023 - 12
SAMPE Journal - May/June 2023 - 13
SAMPE Journal - May/June 2023 - 14
SAMPE Journal - May/June 2023 - 15
SAMPE Journal - May/June 2023 - 16
SAMPE Journal - May/June 2023 - 17
SAMPE Journal - May/June 2023 - 18
SAMPE Journal - May/June 2023 - 19
SAMPE Journal - May/June 2023 - 20
SAMPE Journal - May/June 2023 - 21
SAMPE Journal - May/June 2023 - 22
SAMPE Journal - May/June 2023 - 23
SAMPE Journal - May/June 2023 - 24
SAMPE Journal - May/June 2023 - 25
SAMPE Journal - May/June 2023 - 26
SAMPE Journal - May/June 2023 - 27
SAMPE Journal - May/June 2023 - 28
SAMPE Journal - May/June 2023 - 29
SAMPE Journal - May/June 2023 - 30
SAMPE Journal - May/June 2023 - 31
SAMPE Journal - May/June 2023 - 32
SAMPE Journal - May/June 2023 - 33
SAMPE Journal - May/June 2023 - 34
SAMPE Journal - May/June 2023 - 35
SAMPE Journal - May/June 2023 - 36
SAMPE Journal - May/June 2023 - 37
SAMPE Journal - May/June 2023 - 38
SAMPE Journal - May/June 2023 - 39
SAMPE Journal - May/June 2023 - 40
SAMPE Journal - May/June 2023 - 41
SAMPE Journal - May/June 2023 - 42
SAMPE Journal - May/June 2023 - 43
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SAMPE Journal - May/June 2023 - 45
SAMPE Journal - May/June 2023 - 46
SAMPE Journal - May/June 2023 - 47
SAMPE Journal - May/June 2023 - 48
SAMPE Journal - May/June 2023 - 49
SAMPE Journal - May/June 2023 - 50
SAMPE Journal - May/June 2023 - 51
SAMPE Journal - May/June 2023 - 52
SAMPE Journal - May/June 2023 - 53
SAMPE Journal - May/June 2023 - 54
SAMPE Journal - May/June 2023 - 55
SAMPE Journal - May/June 2023 - 56
SAMPE Journal - May/June 2023 - 57
SAMPE Journal - May/June 2023 - 58
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SAMPE Journal - May/June 2023 - 61
SAMPE Journal - May/June 2023 - 62
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SAMPE Journal - May/June 2023 - 68
SAMPE Journal - May/June 2023 - Cover3
SAMPE Journal - May/June 2023 - Cover4
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