Polysilazane CMC PIP process

From the archived site record

In aircraft engines the lighter weight of CMC components made from KDT's polysilazanes compared to metallic components can reduce fuel consumption allowing for longer range and increased payload.

Structural material made from KDT's organopolysilazanes also have the added advantages of being corrosion resistant and thermally stable to 1000° C.

General Applications for KDT Polysilazane Ceramic Precursors for CMCs KDT organopolysilazane resins function exceptionally well in formulated ceramic coatings for either high temperature applications in excess of 1000 oC, or use in corrosive environments.

Because KDT polysilazanes convert to ceramic at high temperature( conversion occurs above 650 C), they are useful in applications where flame resistance and low or no smoke generation are a concern.

Figures the reports actually state

In the polymer pyrolysis process, multiple infiltrations are needed.

Further, this process yields microcrystalline and often microcracked matrices.

8 Another widely used technique is chemical vapor infiltration (CVI) which is a very slow process requiring a long processing time (often weeks).

In addition, CVI cannot yield full density; composites typically have 10-15% residual porosity) In the SILCOMP TM and other related processes, which are based on molten silicon infiltration, there is very little control over green body porosity, and thick in- terface coatings are required to prevent molten silicon attack.

7,9 From the above, it is clear that the majority of current composite processing techniques are either expensive or have limitations in complex shape and near-net-shape fabrication.

tep process as outlined in Figure 1 polymer synthesis, the forming or shaping of the precursor, a crosslinking reaction to form a green body, and the pyrolysis of the green body [ 2 , 3 ].

Polymer precursors for PDCs encompass a diverse range of organosilicon and non-organosilicon polymers, synthesised through various chemical reactions tailored to their specific structures.

Hydrosilylation of unsaturated polymers is a widely used method for producing silane and siloxane polymers, which are commonly employed as preceramic materials [ 6 , 7 ].

Customised polymers can also be designed to produce precise microstructures, controlled porosities, and tailored properties [ 2 , 8 ].

A variety of commercial polymer precursors are now avail - able, spurring extensive research into their influence on ceramic structures and potential applications.

licon in the form of surface resulting CFCC microstructures often have incomplete sili- 40 lumps is usually observed on the CFCC exterior.

Although con infiltration, high porosity and poor thermo-mechanical post-infiltration machining of these lumps can be properties.

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PIP process steps and temperatures as stated in the cited documents. Verify every figure against the original report before a drawing release.

Source titles on this pass: Characterization of SiC Fiber (SCS-6) Reinforced-Reaction-Formed Silicon Carbide Matrix Composites; A Review of Direct Ink Writing of Polymer Derived Ceramics; Process for making silicon carbide reinforced silicon carbide composite; Silicon carbide reinforced silicon carbide composite; Characterization of SiC (SCS-6) Fiber Reinforced Reaction-Formed Silicon Carbide Matrix Composites; Oxidation of an Environmental Barrier Coated Ceramic Matrix Composite in a Combustion Environme.