Polymer-Derived Ceramic Coil Springs

2015 ◽  
Vol 18 (1) ◽  
pp. 70-75
Author(s):  
Sofia Loginkin ◽  
Lorenz Schlier ◽  
Joseph Harris ◽  
Nahum Travitzky ◽  
Peter Greil
Keyword(s):  
Polymer Derived Ceramic

scholarly journals Insights into the Microstructural Evolution Occurring during Pyrolysis of Metal-Modified Ceramers Studied through Selective SiO2 Removal

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3276
Author(s):  
Aitana Tamayo ◽  
Juan Rubio ◽  
Fausto Rubio ◽  
Mᵃ Angeles Rodriguez
Keyword(s):  
Structural Characteristics ◽  
Domain Size ◽  
Ceramic Composites ◽  
Silicon Oxycarbide ◽  
Crosslinking Degree ◽  
Molecular Precursors ◽  
Textural Characterization ◽  
Polymer Derived Ceramic ◽  
Ultimate Properties ◽  
Lower Carbon

Silicon oxycarbide ceramers containing 5% aluminum, zirconium, and cobalt with respect to the total Si amount are prepared from a commercial polysiloxane and molecular precursors and pyrolyzed at temperatures ranging from 500 to 1000 °C. HF etching is carried out to partially digest the silica phase, thus revealing structural characteristics of the materials, which depend upon the incorporated heteroatom. From the structural and textural characterization, it was deduced that when Al enters into the ceramer structure, the crosslinking degree is increased, leading to lower carbon domain size and carbon incorporation as well. On the contrary, the substitution by Zr induced a phase-separated SiO2-ZrO2 network with some degree of mesoporosity even at high pyrolysis temperatures. Co, however, forms small carbidic crystallites, which strongly modifies the carbonaceous phase in such a way that even when it is added in a small amount and in combination with other heteroatoms, this transient metal dominates the structural characteristics of the ceramer material. This systematic study of the ceramer compounds allows the identification of the ultimate properties of the polymer-derived ceramic composites.

Polymer derived ceramic aerogels

2021 ◽  
Vol 25 (4) ◽  
pp. 100936
Author(s):  
Cekdar Vakifahmetoglu ◽  
Tugce Semerci ◽  
Aleksander Gurlo ◽  
Gian Domenico Soraru
Keyword(s):  
Polymer Derived Ceramic

Activation of percolation network in structural-strengthened polymer-derived ceramic for minor deformation detection

Carbon ◽  
2021 ◽  
Author(s):  
Mingyang Lu ◽  
Hui Mei ◽  
Shixiang Zhou ◽  
Tong Zhao ◽  
Laifei Cheng ◽  
...  
Keyword(s):  
Polymer Derived Ceramic ◽  
Percolation Network

Friction and Wear Behavior of Silicon Carbonitride Processed From the Polymer-Derived Ceramic Route

2005 ◽  
Author(s):  
Tsali Cross ◽  
Somuri Prasad ◽  
Rishi Raj
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Silicon Carbonitride ◽  
Linear Wear ◽  
Polymer Derived Ceramic ◽  
Organometallic Precursors ◽  
Future Work ◽  
Contact Pressures

Polymer derived ceramics (PDC’s) are processed from liquid organometallic precursors by cross-linking the polymers into infusible solids, followed by controlled pyrolysis. No previous work regarding their tribology has been reported. Further, the synthesis of PDC’s as thin films, and the role that the nanostructure plays on the mechanical properties has not been reported. The objective of this research was to evaluate the fundamental tribological behavior of polymer derived SiCN in both bulk and thin film form. Friction and wear evaluations were made on bulk materials and thin films using a Si3N4 ballon-disk linear wear tester at various contact pressures and in different environments that contained various amounts of humidity. The micro/nanostructure was characterized by FTIR, microRaman, and scanning electron microscopy. Bulk SiCN gave a low friction coefficient and good wear resistance in humid environments but showed significant fracture and gouging in dry environments at higher contact pressures. Although there is ambiguity regarding the tribology of the thin films there seems to be a dependence upon the nitrogen content within the materials derived from the polymeric stage. The future work will focus on optimizing processing conditions of thin films and investigating the role that nitrogen plays in both bulk and thin film SiCN materials.

Fabrication and electrical properties of polymer-derived ceramic (PDC) thin films for high-temperature heat flux sensors

2011 ◽  
Vol 165 (2) ◽  
pp. 250-255 ◽  
Author(s):  
Duckbong Seo ◽  
Sunghoon Jung ◽  
Stephen J. Lombardo ◽  
Z.C. Feng ◽  
J.K. Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Flux ◽  
High Temperature ◽  
Electrical Properties ◽  
Heat Flux Sensors ◽  
Polymer Derived Ceramic ◽  
Temperature Heat

scholarly journals Polymer derived ceramic foams with additional strut porosity

2011 ◽  
Vol 63 (3-4.) ◽  
pp. 57-61 ◽  
Author(s):  
Verena Reschke ◽  
Alexandra Laskowsky ◽  
Mathias Kappa ◽  
Kaishi Wang ◽  
Rajendra K. Bordia ◽  
...  
Keyword(s):  
Ceramic Foams ◽  
Polymer Derived Ceramic
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