Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

A CVD-SiC formed body has low light transmittance and high resistivity, and may suitably be used as a member for an etcher that is used for a semiconductor production process, for example. The SiC formed body is formed using a CVD method, and includes 1 to 30 mass ppm of boron atoms, and more than 100 mass ppm and 1000 mass ppm or less of nitrogen atoms. The SiC formed body preferably has a resistivity of more than 10 .Math.cm and 100,000 .Math.cm or less, and a light transmittance at a wavelength of 950 nm of 0 to 1%.

Provided herein are nanofibers and processes of preparing carbonaceous nanofibers. In some embodiments, the nanofibers are high quality, high performance nanofibers, highly coherent nanofibers, highly continuous nanofibers, or the like. In some embodiments, the nanofibers have increased coherence, increased length, few voids and/or defects, and/or other advantageous characteristics. In some instances, the nanofibers are produced by electrospinning a fluid stock having a high loading of nanofiber precursor in the fluid stock. In some instances, the fluid stock comprises well mixed and/or uniformly distributed precursor in the fluid stock. In some instances, the fluid stock is converted into a nanofiber comprising few voids, few defects, long or tunable length, and the like.

A composite material for a secondary lithium battery comprises: nano-silicon and carbon atoms. The carbon atoms are uniformly distributed in the nano-silicon at an atomic level; the carbon atoms and silicon atoms are combined to form an amorphous SiC bond, and no SiC crystal peak exists in an X-ray diffraction (XRD) energy spectrum; in solid nuclear magnetic resonance (NMR) detection of the novel composite material, a .sup.29Si NMR chart shows that, when the silicon peak is between 70 ppm and 130 ppm, there is a SiC resonance peak between 20 ppm and 20 ppm; the area ratio of the SiC resonance peak to the silicon peak is (0.1, 5.0); the average particle size D50 of the novel composite material is 1 nm-50 m; the mass of the carbon atoms accounts for 0.5%-50% of the mass of the novel composite material.

A composite material for a secondary lithium battery comprises: nano-silicon and carbon atoms. The carbon atoms are uniformly distributed in the nano-silicon at an atomic level; the carbon atoms and silicon atoms are combined to form an amorphous SiC bond, and no SiC crystal peak exists in an X-ray diffraction (XRD) energy spectrum; in solid nuclear magnetic resonance (NMR) detection of the novel composite material, a .sup.29Si NMR chart shows that, when the silicon peak is between 70 ppm and 130 ppm, there is a SiC resonance peak between 20 ppm and 20 ppm; the area ratio of the SiC resonance peak to the silicon peak is (0.1, 5.0); the average particle size D50 of the novel composite material is 1 nm-50 m; the mass of the carbon atoms accounts for 0.5%-50% of the mass of the novel composite material.

Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.

This invention provides a method for preparing a polycarbosilane by decomposition and rearrangement a cyclic silane compound or chain polysilane under the catalysis of a boron-containing catalyst in a trace amount (less than 1 wt %). In the method, poly(dimethylsilane) (denoted as PDMS) or a thermal decomposition product thereof, i.e., a liquid silane-carbosilane compound (denoted as LPS), is used as the raw material, less than 1 wt % of the boron-containing catalyst (with respect to the amount of the raw material) is added, and then the temperature is gradually increased to the reaction temperature under atmospheric pressure or high pressure to perform the thermal decomposition/rearrangement reaction so as to obtain solid polycarbosilane (PCS) with a higher ceramic yield. This method has advantages, such as short reaction time, high synthetic yield, good product quality, simple equipment and safe operation; and the polycarbosilane prepared is a polymeric precursor for SiC, and can be used for the preparation of SiC fibers and SiC-based composite materials.