The effects of cold sintering parameters on the densification of Na2WO4 ceramics using Na2WO4·2H2O dry powders

Hao，Jianyu1; Guo，Jing1; Fu，Changli1; Si，Mingming1; Xue，Xian1; Li，Xiaomeng1; Wang，Hong1,2

2022

10.1111/jace.18470

JOURNAL OF THE AMERICAN CERAMIC SOCIETY   影响因子和分区

0002-7820

1551-2916

Cold sintering process (CSP) combines transient liquid phase and/or external pressure to assist the densification of ceramics, the sintering mechanism of which is typically dominated by the “dissolution–precipitation” process. In this work, NaWO·2HO dry powders without liquid water have been used as the “liquid phase” to realize the densification of NaWO ceramics. The effects of sintering parameters on the CSP of NaWO ceramics using NaWO·2HO dry powders are systematically studied, including sintering temperature, external pressure, sintering process time and the amount of NaWO·2HO phase. It is found that the “liquid phase,” that is, NaWO·2HO is the key factor for controlling the CSP of NaWO ceramics, and NaWO·2HO hydrate shows an advantage of homogeneous dispersion of liquid water. The sintering temperature affects the densification mechanism involved with plastic deformation and the “dissolution–precipitation,” external pressure accelerates the densification process, and enough sintering process time ensures the completion of CSP. Finally, the optimum cold sintering parameters of NaWO ceramics by NaWO·2HO powders are obtained at 150°C and 240 MPa for 60 min with a pretreatment at 150°C for 30 min.

cold sintering parameters cold sintering process microwave dielectric material Na2WO4·2H2O hydrate

EI

英语

通讯

20221611980560

Densification ; Dielectric materials ; Dissolution ; Hydrates ; Hydration ; Liquids ; Powders ; Sintering

Dielectric Materials:708.1 ; Chemical Operations:802.3

MATERIALS SCIENCE

2-s2.0-85128196759

Scopus

1.State Key Laboratory for Mechanical Behavior of Materials & School of Electronic and Information Engineering,Xi'an Jiaotong University,Xi'an,China
2.Department of Materials Science and Engineering & Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices,Southern University of Science and Technology,Shenzhen,China

Hao，Jianyu,Guo，Jing,Fu，Changli,et al. The effects of cold sintering parameters on the densification of Na2WO4 ceramics using Na2WO4·2H2O dry powders[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2022,105:5058-5068.

Hao，Jianyu.,Guo，Jing.,Fu，Changli.,Si，Mingming.,Xue，Xian.,...&Wang，Hong.(2022).The effects of cold sintering parameters on the densification of Na2WO4 ceramics using Na2WO4·2H2O dry powders.JOURNAL OF THE AMERICAN CERAMIC SOCIETY,105,5058-5068.

Hao，Jianyu,et al."The effects of cold sintering parameters on the densification of Na2WO4 ceramics using Na2WO4·2H2O dry powders".JOURNAL OF THE AMERICAN CERAMIC SOCIETY 105(2022):5058-5068.