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How to Tame the Aggressiveness of Liquid Silicon in the LSI Process

Mainzer, Bernd and Kelm, Klemens and Watermeyer, Philipp and Frieß, Martin and Koch, Dietmar (2017) How to Tame the Aggressiveness of Liquid Silicon in the LSI Process. Key Engineering Materials, 742, pp. 238-245. Trans Tech Publications. doi: 10.4028/www.scientific.net/KEM.742.238. ISSN 1013-9826.

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Official URL: https://www.scientific.net/KEM.742.238


Liquid Silicon Infiltration (LSI) is a technique to manufacture non-oxide ceramic matrix composites such as C/C-SiC or SiC/SiC. In the beginning of this three-step process, fiber preforms are shaped and impregnated with phenolic resins. After curing, the preforms are pyrolyzed to convert the polymer matrix to a porous carbon matrix. This porosity is then used to infiltrate liquid silicon by capillary forces. Simultaneously, an exothermic reaction of silicon and carbon creates a silicon carbide matrix. Generally the liquid silicon reacts with any carbon and even with SiC present in the form of fibers, fiber coatings or matrix. Therefore, especially the fibers must be protected from Si attack effectively. The morphology of silicon carbide was observed to be heavily driven by Ostwald ripening. This can be suppressed by the addition of boron to the melt. The initially formed SiC crystals in C/C-SiC composites are hereby prevented from grain coarsening, resulting in almost completely preserved C/C blocks. For the manufacture of SiC/SiC composites, the silicon boron alloys allow an effective preservation of the nanocrystalline SiC-fibers. Thus, the use of Si based B containing alloys helps effectively to moderate and control the aggressive reaction during LSI process.

Item URL in elib:https://elib.dlr.de/116025/
Document Type:Article
Title:How to Tame the Aggressiveness of Liquid Silicon in the LSI Process
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Koch, DietmarUNSPECIFIEDhttps://orcid.org/0000-0003-4504-8721UNSPECIFIED
Date:3 July 2017
Journal or Publication Title:Key Engineering Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 238-245
Publisher:Trans Tech Publications
Keywords:C/C-SiC, SiC/SiC, LSI, boron, Tyranno SA3
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Institute of Materials Research
Deposited By: Mainzer, Bernd
Deposited On:24 Nov 2017 12:36
Last Modified:21 Nov 2023 10:27

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