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Manganese dioxide doped hafnium oxide ceramic material and method of producing the same

A technology of manganese dioxide and ceramic materials, applied in the field of hafnium oxide-based ceramics, can solve the problems of low HfO2 content, not widely used, and few researches, and achieve the effects of easy control of reaction conditions, sufficient reaction, and simple operation

Inactive Publication Date: 2009-08-19
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to the HfO in the crust 2 The content is very small (1ug / g), the price is relatively expensive, so it is not widely used, and there are few corresponding studies

Method used

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  • Manganese dioxide doped hafnium oxide ceramic material and method of producing the same

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Embodiment 1

[0016] Such as figure 1 As shown, the tetragonal hafnium oxide ceramic material doped with manganese dioxide according to the present invention is composed of 20% to 50% dopant and 50% to 80% hafnium oxide HfO 2 Composition, the dopant is transition metal oxide manganese dioxide MnO 2 . In this example, hafnium oxide HfO 2 and manganese dioxide MnO 2 The molar percentages are 75% and 25%, respectively.

[0017] The method for preparing the tetragonal hafnium oxide ceramic material doped with manganese dioxide includes the following steps:

[0018] Step 1. Weigh hafnium oxide HfO according to mole percentage 2 and manganese dioxide MnO 2 .

[0019] In this example, due to hafnium oxide HfO 2 and manganese dioxide MnO 2 The molar percentages are 75% and 25%, then pure HfO will be analyzed 2 and MnO 2 According to Hf 0.75 mn 0.25 o 2-δ The stoichiometric ratio was weighed.

[0020] Step 2, the weighed hafnium oxide HfO 2 and manganese dioxide MnO 2 All the powder...

Embodiment 2

[0029] In this example, the difference from Example 1 is that in the tetragonal hafnium oxide ceramic material doped with manganese dioxide to be prepared, hafnium oxide HfO 2 and manganese dioxide MnO 2 The molar percentages are 70% and 30%, respectively.

[0030] Correspondingly, when preparing the tetragonal hafnium oxide ceramic material doped with manganese dioxide, weigh hafnium oxide HfO 2 and manganese dioxide MnO 2 , due to hafnium oxide HfO 2 and manganese dioxide MnO 2 The mole percentage of 70% and 30%, then the pure HfO will be analyzed 2 and MnO 2 According to Hf 0.7 mn 0.3 o 2-δ The stoichiometric ratio is weighed; in step 3, use a press to press the mixed powder obtained after mixing and grinding into a rectangular green sheet with a size of 50mm×5mm×3mm under a pressure of 10MPa; in step 4, press into When the green sheet is put into a high-temperature tube furnace and sintered at a high temperature under an argon atmosphere, the heating rate of the h...

Embodiment 3

[0032] In this example, the difference from Example 1 is that in the tetragonal hafnium oxide ceramic material doped with manganese dioxide to be prepared, hafnium oxide HfO 2 and manganese dioxide MnO 2 The molar percentages are 50% and 50%, respectively.

[0033] Correspondingly, when preparing the tetragonal hafnium oxide ceramic material doped with manganese dioxide, weigh hafnium oxide HfO 2 and manganese dioxide MnO 2 , due to hafnium oxide HfO 2 and manganese dioxide MnO 2The mole percentage of 50% and 50%, then pure HfO will be analyzed 2 and MnO 2 According to Hf 0.5 mn 0.5 o 2-δ The stoichiometric ratio is weighed; in step 3, a press is used to compress the mixed powder obtained after mixing and grinding into a size of circular green sheet; in step 4, when the pressed green sheet is put into a high-temperature tube furnace and sintered at a high temperature under an argon atmosphere, the heating rate of the high-temperature tube furnace is 200° C. / h, and th...

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Abstract

The invention discloses a hafnium oxide ceramic material with manganese dioxide as doping and a preparation method thereof. The hafnium oxide ceramic material is composed of MnO2 with a mol ratio of 20-50% and HfO2 with a mol ratio of 50-80%. The preparation method has the following steps: 1. the MnO2 and HfO2 are respectively weighed according to the mol ratio; 2. the powder of the weighed MnO2 and HfO2 are both poured into a mortar for full grinding and mixing to obtain mixed powder; 3. the mixed powder is made into blank sheets at the pressure of 8-10 MPa by a pressure machine; 4. the blank sheets are put into a high temperature tubular furnace, and after high sintering in argon atmosphere, high sintering sheets are obtained; 5. the high sintering sheets are cooled to room temperature with the furnace, thus obtaining the finished product. In the invention, the technique is simple and clear, the operation is easy and convenient and the cost is low, meanwhile, the manufactured hafnium oxide ceramic material has fine stability and conductivity.

Description

technical field [0001] The invention relates to the technical field of hafnium oxide-based ceramics, in particular to a manganese dioxide-doped hafnium oxide ceramic material and a preparation method thereof. Background technique [0002] Hafnium oxide (HfO 2 ) materials have a wide range of potential applications in catalytic technology, oxygen detectors, high-temperature fuel cells, gate dielectrics and photoconductive devices in oxide semiconductor devices. Hafnium oxide (HfO 2 ) is also a high-temperature structural ceramic material with a melting point as high as 3173K. It has a similar crystal structure and ion conductivity to zirconia, but compared with the latter, HfO 2 The phase transition temperature of the material at high temperature is higher than that of ZrO 2 high, so HfO 2 The material has better thermal shock resistance and higher chemical stability. In the atmospheric environment, there are three allotropes of hafnium oxide, namely monoclinic (m-HfO 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 卢亚锋冯建情李成山闫果白利锋
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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