Synthesis and thermal expansion of 4J36/ZrW2O8 composites

Abstract

Gas atomized 4J36 alloy powder was milled for 72 h then mixed with ZrW 2 O 8 powder and sintered at 600C for 4 h under argon atmosphere. 4J36/ZrW 2 O 8 composites containing 10 vol.%, 20 vol.%, 30 vol.%, and 40 vol.% ZrW 2 O 8 were fabricated, the relative density of which ranged from 70% to 80%. Thermal expansion coefficients of the composites decreased as the amount of ZrW 2 O 8 increased, in agreement with the rule of the mixture. The coefficient of thermal expansion of the 4J36/40 vol.%ZrW 2 O 8 composite in 25-100C is 0.55  10 6 /C.

Two Decades of Negative Thermal Expansion Research: Where Do We Stand?

“…It should be possible to overcome this problem by using HfW 2 O 8 as a filler instead of ZrW 2 O 8 , however, no such attempts have been reported to date. An exploratory investigation on a ZrW 2 O 8 /low expansion steel composite (α steel = 1.5 × 10 −6 K −1 ) still observed formation of γ-ZrW 2 O 8 , clearly indicating that the application of ZrW 2 O 8 will be limited to environments that will not exert significant pressure on the filler particles [191]. …”

Development of designing lightweight composites and structures for tailorable thermal expansion

“…多种纤维混杂复合材料可以更好地实现热膨胀系数 调控. Praveen等人 [29] [30,31] , 因瓦合金 [32] 或铝 [33,34] , 氧化锆陶 瓷 [35,36] , 高分子聚合物 [37,38] 等作为正膨胀基体, 通过 合理配比及相应的制备工艺可以得到零或负膨胀复 合 材料 [39] . 其 他一 些颗粒 增强 复合材 料研 究包括 : Ding 等 人 [40] , Yan 等 人 [41] 分 别 制 备 了 近 零 膨 胀 的 Mn 3 Cu 0.5 A 0.5 N (A=Ni, Sn)/Cu和Mn 3 Cu 0.5 Ge 0.5 N/Cu复 合材料; Liu等人 [42] [43] [44] .…”

Effects of ZrW2O8 Content on the Microstructures and Properties of Composite Coatings Produced by Laser Cladding

“…To regulate the expansion coefficient in composite coatings, some scholars have introduced the negative thermal expansion material ZrW 2 O 8 . This helps control expansion behavior, reduce residual stresses, and achieve zero cracking of the laser fusion cladding layer [15][16][17][18]. Islam et al [19] showed that the inclusion of 1% ZrW 2 O 8 nanoparticles can decrease the degree of thermal expansion mismatch in carbon fiber-reinforced polymer composites during polymerization, thereby reducing thermal expansion mismatch in these composites.…”