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Investigation of Fused Alumina Based-Mold Facecoats for DZ22B Directionally Solidified Blades

1
Shanghai Key Laboratory for High Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
2
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
3
School of Mechanical Engineering, Nantong University, Nantong 226019, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(4), 606; https://doi.org/10.3390/ma12040606
Received: 2 January 2019 / Revised: 5 February 2019 / Accepted: 13 February 2019 / Published: 18 February 2019
The interaction between alloy melt and mold facecoats is the main factor affecting the surface quality of investment casting nickel-based superalloys. An investigation was undertaken to develop suitable refractories as facecoat materials for the directionally solidified blades of DZ22B nickel-based superalloys in order to avoid a sand-burning defect. The wettability and interface reactions between alloy melt and various facecoats were studied by using a sessile drop experiment and the real investment casting method, respectively. The results show that by adding Cr2O3 powder with the amounts of 2 wt.%, 5 wt.% and 10 wt.% in the fused alumina-based facecoats, the wetting angles between the alloy melt and facecoats decreased from 105.40° to 100.37°, 99.96° and 98.11°, respectively, while the sand-burning defect on the casting blade surfaces still formed during the process of directional solidification. However, by adding h-BN powder in the fused alumina-based facecoats, the wetting angles between the alloy melt and facecoats dramatically increased, the sand-burning defect on the casting blade surfaces was effectively inhibited and a metallic luster on the directionally solidified blades could be obviously observed. In this study, the suitable composition of mold facecoats for the investment casting of blades is 2 wt.% h-BN added fused alumina. View Full-Text
Keywords: DZ22B nickel based superalloy; directionally solidified blade; mold facecoat; sand burning; investment casting DZ22B nickel based superalloy; directionally solidified blade; mold facecoat; sand burning; investment casting
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Li, F.; Ni, H.; Yang, L.; Jiang, Y.; Wang, D.; Sun, B. Investigation of Fused Alumina Based-Mold Facecoats for DZ22B Directionally Solidified Blades. Materials 2019, 12, 606.

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