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High-entropy rare earth niobium/tantalum/molybdate ceramic and preparation method thereof
The invention relates to the technical field of high-entropy ceramic materials, and particularly provides high-entropy rare earth niobium/tantalum/molybdate ceramic and a preparation method thereof. The chemical formula of the high-entropy rare earth niobium/tantalum/molybdate ceramic is RE3(Nb1/3Ta1/3Mo1/3)O7, RE is any 3-7 different elements of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb and Lu. The preparation method comprises the following steps of (1) weighing rare earth oxide, niobium pentoxide, tantalum pentoxide, molybdenum trioxide and molybdenum dioxide according to a stoichiometric ratio, (2) adding a solvent and a ball-milling medium, ball-milling and mixing the raw materials by adopting a wet method, and carrying out vacuum drying and sieving to obtain uniformly mixed powder, (3) placing the uniformly mixed powder in a stainless steel mold for hydraulic compaction, and then carrying out cold isostatic pressing to obtain a densified green body, and (4) putting the green body into an alumina crucible, putting the alumina crucible into a high-temperature sintering furnace, and sintering in an air atmosphere. The prepared high-entropy ceramic is low in heat conductivity, the adopted preparation method has the advantages of being simple and rapid in process, low in equipment requirement, low in energy consumption, high in controllability and the like, and large-scale production is easy to achieve.
本发明涉及高熵陶瓷材料技术领域，具体提供一种高熵稀土铌/钽/钼酸盐陶瓷及其制备方法。所述高熵稀土铌/钽/钼酸盐陶瓷化学式为RE3(Nb1/3Ta1/3Mo1/3)O7，其中RE为Y，Nd，Sm，Eu，Gd，Dy，Ho，Er，Yb和Lu中的任意3～7种不同元素。其制备方法包括如下步骤：(1)按化学计量比称量稀土氧化物、五氧化二铌、五氧化二钽、三氧化钼和二氧化钼；(2)加入溶剂和球磨介质，采用湿法球磨混合原材料，经真空干燥、过筛得到混合均匀的粉体；(3)将混合均匀的粉体置于不锈钢模具内液压压实，再经过冷等静压得到致密化的坯体；(4)将坯体装入氧化铝坩埚，并置于高温烧结炉内，在空气气氛中烧结。本发明制备的高熵陶瓷热导率低，采用的制备方法具有工艺简单快速、设备要求低、能耗低、可操控性强等优点，容易实现规模化生产。
High-entropy rare earth niobium/tantalum/molybdate ceramic and preparation method thereof
The invention relates to the technical field of high-entropy ceramic materials, and particularly provides high-entropy rare earth niobium/tantalum/molybdate ceramic and a preparation method thereof. The chemical formula of the high-entropy rare earth niobium/tantalum/molybdate ceramic is RE3(Nb1/3Ta1/3Mo1/3)O7, RE is any 3-7 different elements of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb and Lu. The preparation method comprises the following steps of (1) weighing rare earth oxide, niobium pentoxide, tantalum pentoxide, molybdenum trioxide and molybdenum dioxide according to a stoichiometric ratio, (2) adding a solvent and a ball-milling medium, ball-milling and mixing the raw materials by adopting a wet method, and carrying out vacuum drying and sieving to obtain uniformly mixed powder, (3) placing the uniformly mixed powder in a stainless steel mold for hydraulic compaction, and then carrying out cold isostatic pressing to obtain a densified green body, and (4) putting the green body into an alumina crucible, putting the alumina crucible into a high-temperature sintering furnace, and sintering in an air atmosphere. The prepared high-entropy ceramic is low in heat conductivity, the adopted preparation method has the advantages of being simple and rapid in process, low in equipment requirement, low in energy consumption, high in controllability and the like, and large-scale production is easy to achieve.
本发明涉及高熵陶瓷材料技术领域，具体提供一种高熵稀土铌/钽/钼酸盐陶瓷及其制备方法。所述高熵稀土铌/钽/钼酸盐陶瓷化学式为RE3(Nb1/3Ta1/3Mo1/3)O7，其中RE为Y，Nd，Sm，Eu，Gd，Dy，Ho，Er，Yb和Lu中的任意3～7种不同元素。其制备方法包括如下步骤：(1)按化学计量比称量稀土氧化物、五氧化二铌、五氧化二钽、三氧化钼和二氧化钼；(2)加入溶剂和球磨介质，采用湿法球磨混合原材料，经真空干燥、过筛得到混合均匀的粉体；(3)将混合均匀的粉体置于不锈钢模具内液压压实，再经过冷等静压得到致密化的坯体；(4)将坯体装入氧化铝坩埚，并置于高温烧结炉内，在空气气氛中烧结。本发明制备的高熵陶瓷热导率低，采用的制备方法具有工艺简单快速、设备要求低、能耗低、可操控性强等优点，容易实现规模化生产。
High-entropy rare earth niobium/tantalum/molybdate ceramic and preparation method thereof
一种高熵稀土铌/钽/钼酸盐陶瓷及其制备方法
SUN GUOXUN (author) / WANG WEILI (author) / SUN XIAONING (author) / ZHANG AIMIN (author)
2021-05-25
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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