Mechanical Properties and Cutting Performance of Si3N4/Sc2W3O12 Composite Ceramic Tools Materials
Zhiyuan Zhang, Xiaolan Bai, Jingjie Zhang, Mingdong Yi, Guangchun Xiao, Tingting Zhou, Hui Chen, Zhaoqiang Chen, Chonghai Xu
TL;DR
A new ceramic material was developed to improve thermal stability and cutting performance in tools.
Contribution
A novel Si3N4/Sc2W3O12 composite ceramic with enhanced mechanical and thermal properties was developed using spark plasma sintering.
Findings
SNS3 (12 wt.% Sc2W3O12) achieved high flexural strength (712.4 MPa) and fracture toughness (7.5 MPa·m1/2).
The composite reduced workpiece surface roughness by 32.91% and reached a cutting distance of 9500 m.
A 'hard core–soft shell' interface formed at grain boundaries, improving crack resistance and stress buffering.
Abstract
To address the poor thermal shock resistance and high brittleness of traditional ceramic tools, a novel Si3N4/Sc2W3O12 (SNS) composite ceramic material was developed via in situ synthesis using WO3 and Sc2O3 as precursors and consolidated by spark plasma sintering. Sc2W3O12 with negative thermal expansion was introduced to compensate for matrix shrinkage and modulate interfacial stress. The effects of varying Sc2W3O12 content on thermal expansion, residual stress, microstructure, and mechanical properties were systematically investigated. Among the compositions, SNS3 (12 wt.% Sc2W3O12) exhibited the best overall performance: relative density of 98.8 ± 0.2%, flexural strength of 712.4 ± 30 MPa, fracture toughness of 7.5 ± 0.3 MPa·m1/2, Vickers hardness of 16.3 ± 0.3 GPa, and an average thermal expansion coefficient of 2.81 × 10−6·K−1. The formation of a spherical chain-like Sc-W-O phase…
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Taxonomy
TopicsThermal Expansion and Ionic Conductivity · Advanced materials and composites · Advanced ceramic materials synthesis