One Of High Level Materials Silicon Nitride

Porous silicon nitride ceramics with high porosity and uniform pore structure were prepared by carbon-thermal reduction-reaction sintering method using cheap silica, carbon black and silicon powder as starting materials, and the effects of silicon powder content in raw materials on the microstructure and mechanical properties of porous silicon nitride ceramics were investigated. XRD analysis showed that the composition of the sintered specimen was β-Si3N4 phase, except for a small amount of -Si3N4 phase and intergranular phase Y2Si3O3N4. SEM analysis showed that the microstructure was composed of rod-shaped β-Si3N4 grains and uniform pores. By changing the content of silicon fume, porous silicon nitride ceramics with different porosities and excellent mechanical properties were prepared.

1.A dual-frequency laser input cavity-free normal dispersive silicon nitride optical waveguide to generate optical frequency comb, and numerical simulation. The normal dispersion control and optimization of the silicon nitride optical waveguide is carried out, and the peak power of the phase-locked dual-frequency laser with an initial total power of 1W is increased to 30W through two-stage chirped pulse compression by using quartz-based high nonlinear fiber and ordinary single-mode optical fiber, and a 3m long normal dispersion silicon nitride nonlinear optical waveguide is input, and based on the combined effect of normal dispersion, self-phase modulation and light wave splitting, the optical frequency comb with a bandwidth of about 100nm in the 1550nm band with a bandwidth of about 100 nm is simulated. The effect of pulse shaping on the flatness of the optical frequency comb is studied, and the flat optical frequency comb with a bandwidth of about 57 nm can be realized by shaping the pulses into Gaussian pulses. The influence of the power ratio and frequency interval of the phase-locked dual-frequency laser on the optical frequency comb is studied.

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