Pressureless sintering of high performance silicon nitride ceramics at 1620 °C
Source abstract
Abstract
Abstract MgO-LiF is used as a sintering aid for the pressureless sintering of silicon nitride (Si3N4) ceramics at 1620 °C. The effects of different LiF contents on the mechanical and thermal properties of Si3N4 ceramics were studied in detail. Si3N4 ceramics with a relative density of 92.08 % were obtained with the addition of 7 wt% MgO + 3 wt% LiF. These ceramics were sintered at 1620 °C. The bending strength, hardness, fracture toughness, and thermal conductivity were 556.73 (± 10.18) MPa, 9.07 (± 0.07) GPa, 6.02 (± 0.29) MPa/m1/2 and 47.59 (± 0.03) W/(m·K), respectively. Si3N4 ceramics with different LiF contents were characterized using XRD and SEM. The introduction of LiF was found to have a positive effect on the transition from the α phase to the β phase in Si3N4 ceramics. The results demonstrate that MgO-LiF is an effective sintering aid for pressureless sintering of silicon nitride ceramics.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · MXene and MAX Phase Materials · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (32)
Show source-provided references
1. Silicon nitride and related materials10.1111/j.1151-2916.2000.tb01182.x ↗
2. Development of high-thermal-conductivity silicon nitride ceramics10.1016/j.jascer.2015.03.003 ↗
3. Modern IC packaging trends and their reliability implications10.1016/j.microrel.2006.08.008 ↗
4. Electronic systems packaging: future reliability challenges10.1016/S0026-2714(98)00129-2 ↗
5. Studies on the Al2OC mesophase in synthesized AlN powder and its effects on properties of AlN ceramic substrates10.1016/j.ceramint.2020.05.195 ↗
6. Co-fired AlN–TiN assembly as a new substrate technology for high-temperature power electronics packaging10.1016/j.ceramint.2013.04.060 ↗
7. Effects of Y2O3 and yttrium aluminates as sintering additives on the thermal conductivity of AlN ceramic substrates10.1016/j.ceramint.2018.07.178 ↗
8. Effect of powder, chemistry and morphology on the dielectric properties of liquid-phase-sintered alumina10.1016/S0272-8842(01)00116-X ↗
9. Hydrolysis behavior of aluminum nitride in various solutions10.1023/A:1004718329003 ↗
10. Mechanical and electrical properties of carbon nanotube-reinforced Al2O3 nanocomposites10.1007/s10853-019-04173-5 ↗
11. Effect of TiX(X=C, N, O) additives on microstructure and properties of silicon nitride based ceramics10.1016/j.scriptamat.2005.05.024 ↗
12. Relationships between processing, microstructure and properties of dense and reaction-bonded silicon nitride10.1007/BF01161167 ↗
13. Low temperature pressureless sintering of dense silicon nitride using BaO-AL2O3-SiO2 glass as sintering aid10.1016/j.ceramint.2017.05.033 ↗
14. Low temperature pressureless sintering of silicon nitride ceramics for circuit substrates in powder electronic devices10.1016/j.ceramint.2017.12.033 ↗
15. Densification, mass loss, and mechanical properties of low-temperature pressureless-sintered Si3N4 with LiYO2 additive: the effects of additive content and annealing10.1111/j.1744-7402.2009.02402.x ↗
16. A tough silicon nitride ceramic with hgh thermal conductivity10.1002/adma.201102462 ↗
17. Effect of phase ratio on microstructure and mechanical properties of silicon nitride ceramics10.1557/JMR.2001.0311 ↗
18. High hardness α-Si3N4 ceramics reinforced by rod-like β-Si3N4 seed particles10.2109/jcersj.108.1259_646 ↗
19. Effect of oxygen impurities on the phase composition of self-propagating high-temperature synthesis products in the α-Si3N4–MgO system10.1134/S0020168518050175 ↗
20. Microstructural evolution mechanism of porous reaction bonded silicon nitride ceramics heat-treated in two powder beds10.1016/j.ceramint.2019.07.213 ↗
21. Enhanced mechanical properties of Si3N4 ceramics with ZrB2-B binary additives prepared at low temperature10.1016/j.jeurceramsoc.2019.07.028 ↗
22. First-principles study of the effects of halogen dopants on the properties of intergranular films in silicon nitride ceramics10.1103/PhysRevB.65.064113 ↗
23. High-pressure spark plasma sintering of silicon nitride with LiF additive10.1016/j.jeurceramsoc.2017.10.034 ↗
24. Rana · 1977
25. A critical evaluation of indentation techniques for measuring fracture toughness: I, direct crack measurements10.1111/j.1151-2916.1981.tb10320.x ↗
26. MgSiN2 addition as a means of increasing the thermal conductivity of β‐silicon nitride10.1111/j.1151-2916.2001.tb01141.x ↗
27. A hrem study of the structure defects in α-Si3N410.1016/0167-577X(84)90005-3 ↗
28. Silicon nitride ceramics with high thermal conductivity and excellent mechanical properties fabricated with MgF2 sintering aid and post-sintering heat treatment
29. Hot-pressing behavior of Si3N410.1111/j.1151-2916.1974.tb11356.x ↗
30. Reactions between metal oxides and fluorides: some new double‐fluoride structures of type ABF310.1107/S0365110X52002240 ↗
31. Microstructure and fracture toughness of Si3N4 ceramics: combined roles of grain morphology and secondary phase chemistry10.1111/j.1151-2916.1999.tb02009.x ↗
32. Thermal conductivity of β-Si3N4: II, effect of lattice oxygen10.1111/j.1151-2916.2000.tb01501.x ↗