SINCO ultrafine powder refers to the inorganic ceramic compound of silicon-amino-carbon-oxygen complex obtained by cracking the organic silicon resin polysilazane. It is a powder with a particle size of 100nm. Chlorosilane resin reacts with nitrogen to form polysilazane, which is partially cross-linked to obtain a glassy resin - precursor. In a vacuum or any of the protective atmospheres of H2 or N2, it is cracked at a temperature above 1000°C to obtain a black honeycomb body. After grinding, it yields amorphous ultrafine black powder. 
Introduction
SINCO ultrafine powder refers to the inorganic ceramic compound composed of silicon, nitrogen and carbon obtained by the pyrolysis of organic silicon resin polysilazane. It is a powder with a particle size of 100nm. 1 
Principle 
Chlorosilane resin reacts with nitrogen to form polysilazane. After partial cross-linking, it yields a glassy resin, known as the precursor. It is pyrolyzed at temperatures above 1000°C in a vacuum, H2, or N2 protective atmosphere to obtain a black honeycomb body. After grinding, it yields amorphous ultrafine black powder. Its composition is SiC, Si2, N-2, Si2N2O, and SiO2. The powder has a flowability of 48.1s/20g, a bulk density of 0.15g/cm3, a powder density of 2.25g/cm3, a specific surface area of 18.8g/cm2, and the powder and SINCO ceramic sintered body are amorphous below 1500°C and stable in air at 1200°C. The hardness of the sintered body increases with the degree of densification, from HV996 to HV1370, the blackness is as high as 9.6 levels, the infrared absorption rate is greater than 90%, and it is similar to iron. 
Microwave absorption rate of magnetic ultrafine powder mixture: Band half-width value B.H = 5.981 GHz, microwave absorption rate R = -17.11 dB, frequency 11.196 GHz. SINCO powder is difficult to be formed and sintered. It is sintered at 1180℃ by hot pressing. It has higher strength than SiC, and the sintered body has good self-lubrication property and low electrical conductivity. 
Application
The SINCO powder reacts with magnesium silicate to form a solid solution, reducing the sintering temperature from 1550°C to 1200°C. This improvement in sinterability makes the ultrafine SINCO powder suitable for use as functional materials, such as microwave and infrared absorbers. It can be hot-pressed into ceramic sealing rings, improving defects like sintering cracks in talc ceramics, and also being applied as a high-temperature ceramic structural material. 
Ultrafine powder 
Ultrafine powder can be classified into two major categories: the crushing method and the synthesis method. The crushing method involves atomizing large volumes of molten material or microfining particles (using fluid energy grinding), while the synthesis method involves forming particles through the nucleation and growth processes of atoms or molecules. Among these, the evaporation vaporization - condensation method is the main method for preparing high-purity ultrafine powder, but it has low productivity and high cost.
When manufacturing components using powder molding, when the powder reaches an ultrafine state, the components often have very excellent properties. For example, to manufacture ceramic tools (such as cutting tools and turbine blades) with high temperature resistance and high strength, ultrafine powder is required for molding and subsequent sintering. It is a type of formulation of powdered commercial dyes. Its particles are very fine and uniform, also known as suspension body dyeing fine powder. It refers to the varieties of reducing dyes that can be directly used in the suspension body dyeing process.