Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds

Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds

Urchin-like mullite whiskers synthesized by the vapor&#8211;liquid&#8211;solid growth method were used to improve the high-temperature performance of porous gelcast SiO<sub>2</sub>-based ceramic molds. Aluminum was used to facilitate the synthesis of polycrystal urchin-like mulli...

Full description

Bibliographic Details
Main Authors: Yi Chen, Zhongliang Lu, Weijian Wan, Jian Li, Kai Miao, Dichen Li
Format: Article
Language:English
Published: MDPI AG 2019-04-01
Series:Materials
Subjects:
urchin-like mullite whiskers
high-temperature strength
SiO<sub>2</sub> ceramic
Al additive
gelcasting
Online Access:https://www.mdpi.com/1996-1944/12/7/1181
id doaj-6ee24fdf02e444f3921ac16316a6beb8
record_format Article
spelling doaj-6ee24fdf02e444f3921ac16316a6beb82020-11-25T00:56:22ZengMDPI AGMaterials1996-19442019-04-01127118110.3390/ma12071181ma12071181Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic MoldsYi Chen0Zhongliang Lu1Weijian Wan2Jian Li3Kai Miao4Dichen Li5State Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaUrchin-like mullite whiskers synthesized by the vapor&#8211;liquid&#8211;solid growth method were used to improve the high-temperature performance of porous gelcast SiO<sub>2</sub>-based ceramic molds. Aluminum was used to facilitate the synthesis of polycrystal urchin-like mullite whiskers which acted as bridges between particles. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to investigate the microstructures and phase compositions of the sintered ceramic samples, respectively. Urchin-like mullite whiskers with diameters of 0.2~1.0 &#181;m and lengths of 1.0~8.0 &#181;m were successfully synthesized in SiO<sub>2</sub>-based ceramic. When 15 vol% Al was added, the high-temperature strength at 1200 &#176;C was improved from 8.5 to 27.5 MPa, and the creep deformation was decreased to 0.56 mm. Meanwhile, a sintering shrinkage below 0.3% was obtained, and the de-coring rate was accelerated by 67% compared to that of the pure SiO<sub>2</sub>-based ceramic. This method showed excellent high-temperature strength and high precision, having remarkable potential in the fabrication of hollow turbine blades.https://www.mdpi.com/1996-1944/12/7/1181urchin-like mullite whiskershigh-temperature strengthSiO<sub>2</sub> ceramicAl additivegelcasting
collection DOAJ
language English
format Article
sources DOAJ
author Yi Chen
Zhongliang Lu
Weijian Wan
Jian Li
Kai Miao
Dichen Li
spellingShingle Yi Chen
Zhongliang Lu
Weijian Wan
Jian Li
Kai Miao
Dichen Li
Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds
Materials
urchin-like mullite whiskers
high-temperature strength
SiO<sub>2</sub> ceramic
Al additive
gelcasting
author_facet Yi Chen
Zhongliang Lu
Weijian Wan
Jian Li
Kai Miao
Dichen Li
author_sort Yi Chen
title Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds
title_short Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds
title_full Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds
title_fullStr Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds
title_full_unstemmed Effect of Urchin-Like Mullite Whiskers on the High-Temperature Performance of Porous SiO<sub>2</sub>-Based Ceramic Molds
title_sort effect of urchin-like mullite whiskers on the high-temperature performance of porous sio<sub>2</sub>-based ceramic molds
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-04-01
description Urchin-like mullite whiskers synthesized by the vapor&#8211;liquid&#8211;solid growth method were used to improve the high-temperature performance of porous gelcast SiO<sub>2</sub>-based ceramic molds. Aluminum was used to facilitate the synthesis of polycrystal urchin-like mullite whiskers which acted as bridges between particles. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to investigate the microstructures and phase compositions of the sintered ceramic samples, respectively. Urchin-like mullite whiskers with diameters of 0.2~1.0 &#181;m and lengths of 1.0~8.0 &#181;m were successfully synthesized in SiO<sub>2</sub>-based ceramic. When 15 vol% Al was added, the high-temperature strength at 1200 &#176;C was improved from 8.5 to 27.5 MPa, and the creep deformation was decreased to 0.56 mm. Meanwhile, a sintering shrinkage below 0.3% was obtained, and the de-coring rate was accelerated by 67% compared to that of the pure SiO<sub>2</sub>-based ceramic. This method showed excellent high-temperature strength and high precision, having remarkable potential in the fabrication of hollow turbine blades.
topic urchin-like mullite whiskers
high-temperature strength
SiO<sub>2</sub> ceramic
Al additive
gelcasting
url https://www.mdpi.com/1996-1944/12/7/1181
work_keys_str_mv AT yichen effectofurchinlikemullitewhiskersonthehightemperatureperformanceofporoussiosub2subbasedceramicmolds
AT zhonglianglu effectofurchinlikemullitewhiskersonthehightemperatureperformanceofporoussiosub2subbasedceramicmolds
AT weijianwan effectofurchinlikemullitewhiskersonthehightemperatureperformanceofporoussiosub2subbasedceramicmolds
AT jianli effectofurchinlikemullitewhiskersonthehightemperatureperformanceofporoussiosub2subbasedceramicmolds
AT kaimiao effectofurchinlikemullitewhiskersonthehightemperatureperformanceofporoussiosub2subbasedceramicmolds
AT dichenli effectofurchinlikemullitewhiskersonthehightemperatureperformanceofporoussiosub2subbasedceramicmolds
_version_ 1725227520354156544

Similar Items