Nowadays, porous Si₃N₄ ceramics are fabricated by high purity α-Si₃N₄ powders, resulting in a higher cost of production. To reduce cost and save energy, in this research, high levels of β-Si₃N₄ powders were effectively utilized to produce excellent and low-cost porous Si₃N₄ ceramics. The effects of high levels of β-Si₃N₄ powders on the microstructural evolution and properties were investigated in detail. The results suggested that, with the increase in β-Si₃N₄ powders from 0 wt.% to 80 wt.%, the aspect ratio of β-Si₃N₄ grains gradually decreased because of the anisotropic growth of grains significantly impinged by adjacent other β-Si₃N₄ grains. Additionally, the bending strength and dielectric constant of porous silicon nitride ceramics declined and their values were 685 MPa - 220 MPa, and 7.58–5.57, respectively, while the porosity increased from 5.9% to 28.5%. Similarly, the residual bending strength of Si₃N₄ ceramics degraded from 615 MPa to 172 MPa at 1000 °C for 20 h owing to the formation of SiO₂ on the surface of silicon nitride ceramics after oxidizing.

如今，多孔Si ₃ Ñ ₄陶瓷是由高纯度的α-制造的Si _3成Ñ _4成粉末，导致生产成本较高。为了降低成本和节省能源，在本研究中，高水平的β型Si的_3成Ñ ₄粉末有效地利用，以产生优良的和低成本的多孔Si ₃ Ñ _4个陶瓷。高水平的β-Si组成的影响₃ Ñ _4成粉末的组织演变和属性详细进行了研究。结果表明，随着增加β型Si ₃ ñ _4成粉末从0重量％至80重量％，的纵横比β型Si ₃Ñ ₄因为由相邻的其它β型Si显著冲击晶粒的各向异性生长的晶粒逐渐下降₃ Ñ ₄晶粒。另外，多孔氮化硅陶瓷的抗弯强度和介电常数下降，其值分别为685 MPa-220 MPa和7.58-5.57，而孔隙率从5.9％增加到28.5％。类似地，由于氧化后氮化硅陶瓷表面上形成了SiO ₂，Si ₃ N ₄陶瓷的残余弯曲强度在1000°C下20 h从615 MPa降低到172 MPa 。