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Effect of MgO and PVA on the Synthesis and Properties of Negative Thermal Expansion Ceramics of Zr 2 ( WO 4 )( PO 4 ) 2
Author(s) -
Shang Rui,
Hu Qinglun,
Liu Xiansheng,
Liang Erjun,
Yuan Bin,
Chao Mingju
Publication year - 2012
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2012.02787.x
Subject(s) - materials science , sintering , ceramic , raw material , thermal expansion , polyvinyl alcohol , relative density , grain size , chemical engineering , nuclear chemistry , composite material , organic chemistry , chemistry , engineering
A green synthesis of Zr 2 ( WO 4 )( PO 4 ) 2 ceramics from ZrO 2 , WO 3 and P 2 O 5 is presented. It is shown that the ceramics can be synthesized by one‐step sintering within 60 min. The relative density of the ceramics can be enhanced from about 75% without sintering additives to 99.8% of the theoretical value with 1.0 wt% MgO and 2.0 wt% polyvinyl alcohol. The grain sizes of the ceramics are smaller and more uniform with MgO added in the raw materials than with MgO added in the Zr 2 ( WO 4 )( PO 4 ) 2 powder. The coefficients of thermal expansion are about −2.325 × 10 −6 , −1.406 × 10 −6 , −1.509 × 10 −6 and −1.384 × 10 −6 °C −1 for the samples without MgO, with MgO added in the raw materials, with MgO added in the Zr 2 ( WO 4 )( PO 4 ) 2 powder and with MgO and PVA added in the raw materials, respectively.