On the fabrication and mechanical properties of Si3N4 ceramics with low content sintering additives

Si3N4 ceramics were prepared by hot pressing (HP) and spark plasma sintering (SPS) methods using low content (5 mol%) Al2O3–RE2O3(RE = Y, Yb, and
La)–SiO2/TiN as sintering additives/secondary additives. The effects of sintering additives and sintering methods on the composition, microstructures, and
mechanical properties (hardness and fracture toughness) were investigated. The results show that fully density Si3N4 ceramics could be fabricated by rational tailoring of sintering additives and sintering method, and TiN secondary additive could promote the density during HP and SPS. Besides, SN-AYS-SPS possesses
the most competitive mechanical properties among all the as-prepared ceramics with the Vickers hardness as 17.31 ± .43 GPa and fracture toughness as 11.07 ± .48 MPa m1/2.

本研究以低含量（5摩尔%）的Al₂O₃-RE₂O₃（RE=Y、Yb、La）-SiO₂/TiN作为烧结助剂/第二助剂，采用热压烧结（Hot Pressing, HP）与放电等离子烧结（Spark Plasma Sintering, SPS）两种方法制备Si₃N₄陶瓷。系统研究了烧结助剂与烧结工艺对陶瓷的物相组成、微观结构及力学性能（硬度与断裂韧性）的影响。结果表明，通过合理调控烧结助剂与烧结工艺，可制备得到全致密Si₃N₄陶瓷；TiN第二助剂可在HP与SPS工艺中促进陶瓷致密度提升。此外，在所制备的全部陶瓷样品中，SN-AYS-SPS的综合力学性能最为优异，其维氏硬度为17.31±0.43 GPa，断裂韧性为11.07±0.48 MPa·m^(1/2)。

搜集汇总

背景与挑战

背景概述

该数据集是一篇关于低含量烧结添加剂Si3N4陶瓷的制备与机械性能研究的论文，通过热压和放电等离子烧结方法，使用低含量（5 mol%）Al2O3–RE2O3–SiO2/TiN添加剂，探讨了添加剂和烧结方法对陶瓷组成、微观结构和机械性能（如硬度和断裂韧性）的影响。研究发现，通过合理优化添加剂和烧结工艺可以制备出全密度陶瓷，其中SN-AYS-SPS样品表现出最优的机械性能，维氏硬度达17.31 ± 0.43 GPa，断裂韧性为11.07 ± 0.48 MPa m1/2。