Weide WANG, Huanbei CHEN, Shishuai LI, Dongxu YAO, Kaihui ZUO, Yuping ZENG. Preparation of Silicon Nitride with High Thermal Conductivity and High Flexural Strength Using YbH2-MgO as Sintering Additive [J]. Journal of Inorganic Materials, 2021, 36(9): 959
- Journal of Inorganic Materials
- Vol. 36, Issue 9, 959 (2021)
1. (a) Elemental distributions of YbHM after ball milling, (b) XRD patterns of α -Si3N4 raw powder, YbHM after ball milling, and YbHM after pre-sintering, (c) elemental distributions of YbHM after pre-sintering
2. XRD patterns of powder mixture of YbH2 and SiO2 with moler ratio of 1 : 1 before and after pre-sintering
3. (a) In-situ observation of shrinkage behaviors of the Si3N4 ceramics, (b) relative density after gas-pressure sintering, and (c) weight loss after gas-pressure sintering
4. XRD patterns of Si3N4 samples after being sintered at 1900 ℃ for 4 and 24 h
5. Elemental distributions of sample YbHM after being sintered at 1900 ℃ for 12 h
6. SEM images of the polished surfaces
7. EDS analysis of the intergranular phases in YbOM and YbHM specimens
8. (a) Thermal conductivities and (b) flexural strengths of Si3N4 samples after gas pressure sintering
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Table 1. Thermal conductivities of Si3N4 doped with different rare-earth hydride
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