Progress in Preparation and Properties of Porous Silicon Nitride Ceramics

Abstract

Porous silicon nitride ceramics is a promising functional ceramic material. In recent years, the research on the preparation of porous silicon nitride ceramics within different methods has been widely investigated. First, this work reviews the main synthesis methods of Si 3 N 4 porous ceramics in detail, and compares the differences between strength and porosity caused by each method. The characteristics and advantages of different technologies under the current conditions were evaluated. Second, the dielectric properties, sound absorption properties and permeability properties of silicon nitride ceramics were compared and summarized based on the experimental results. Third, the applications fields of porous silicon nitride ceramics, such as smelting industry, catalyst carrier, sound absorption, wave-transparent, and biomedical fields were explored. Finally, the assessment of different silicon nitride ceramics preparation technologies was elaborated. This review gives an outlook on the porous silicon nitride ceramics, which shows great potential for further research in this field.

High-Performance Microwave Absorption Materials: Theory, Fabrication, and Functionalization

“…Taking these into consideration, some new ceramic preparation methods were developed accordingly. 105 Polymer-derived ceramics (PDCs) technology is one of the most important preparation methods. Compared with other preparation processes, the required sintering temperature of PDCs route is lower, and no auxiliary materials is required.…”

“…Due to the high sintering temperature and the long sintering time, ceramic MAMs have the problems of high preparation cost and complicated process. Taking these into consideration, some new ceramic preparation methods were developed accordingly . Polymer-derived ceramics (PDCs) technology is one of the most important preparation methods.…”

Preparation of multifunctional ceramic foams for sound absorption, waterproofing, and antibacterial applications

“…15 Porous inorganic nonmetallic materials, such as ceramic foams, eliminate the shortcomings of organic and metallic materials and demonstrate unique advantages, such as good thermal and chemical stability, which make them ideal candidates for sound reduction in crucial environments. 16–18 For example, Du et al investigated the effect of structural factors on the sound absorption properties of silicon nitride ceramic foams and the results revealed that higher porosity and smaller pore size were conducive to better sound absorption by these ceramic foams. 7 They could withstand a sintering temperature of 1700 °C, indicating that such ceramic foams could be used in critically high temperatures.…”

Dielectric and mechanical properties of porous Si3N4–Kovar composites prepared by low‐temperature oxidation sintering

“…12 Composites with low dielectric constant can be prepared by introducing the second phase with a low dielectric constant and high strength and combining the pores with the second phase of low dielectric constant. [13][14][15][16] Boron nitride (BN) possesses a low dielectric constant and unique lamellar structure, which can introduce certain pores when the lamellar grains overlap. Feng et al 17 introduced BN to reduce the dielectric constant of silicon nitride ceramics.…”

“…This is due to the fact that mechanical properties become worse with increased porosity 12 . Composites with low dielectric constant can be prepared by introducing the second phase with a low dielectric constant and high strength and combining the pores with the second phase of low dielectric constant 13–16 . Boron nitride (BN) possesses a low dielectric constant and unique lamellar structure, which can introduce certain pores when the lamellar grains overlap.…”