Sintering method of yttrium oxide base transparent ceramic

A technology of transparent ceramics and sintering method, which is applied in the field of ceramic material preparation and can solve the problems of difficult operation and high cost

Active Publication Date: 2010-04-28
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sintering method involves high costs and is not easy to operate

Method used

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  • Sintering method of yttrium oxide base transparent ceramic
  • Sintering method of yttrium oxide base transparent ceramic
  • Sintering method of yttrium oxide base transparent ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: the yttrium oxide powder that is mixed with 7at% lanthanum oxide (the molar number of lanthanum element accounts for the percentage of the sum of lanthanum element and yttrium element molar weight is 7%) (powder particle size is 50~500nm) is mixed with 200MPa The cold isostatic pressed sample was placed in a muffle furnace, and the temperature was raised to 1450°C at a rate of 20°C / min, and then immediately lowered to 900°C at a rate of 50°C / min, and kept at this temperature for 20 hours. Then the sample was taken out at 1800°C for 10 -3 Sintering under Pa vacuum for 8 hours to obtain a 1mm thickness transparent yttrium oxide ceramic sample, see the attached figure 1 , figure 1 A photograph of a transparent ceramic sample standing on paper. image 3 It is a schematic diagram of the sintering process, in which the first step is heating to 1450°C in air, and then immediately cooling down to 900°C; the second step is holding the temperature for 20 hours; th...

Embodiment 2

[0039] Embodiment 2: the yttrium oxide powder that is mixed with 7at% lanthanum oxide (the mole number of lanthanum element accounts for the percentage of the sum of lanthanum element and yttrium element mole number is 7%) (powder particle size is 50~500nm) 200MPa cooling Put it into a muffle furnace after isostatic pressing, raise the temperature to 1350°C at a rate of 5°C / min, immediately cool down to 1000°C at 30°C / min, and keep the temperature for 40 hours. Then put the sample in a vacuum furnace and sinter at 1700°C for 2 hours to obtain a transparent ceramic with a thickness of 2mm, see attached figure 2 , figure 2 It is a photo taken of a transparent ceramic sample 40cm above the white paper and 20cm in front of the camera lens. The chemical formula of the prepared yttrium oxide-based transparent ceramics is Y 1.86 La 0.14 o 3 .

Embodiment 3

[0040] Example 3: Mixed powder composed of yttrium oxide powder and zirconia powder (the percentage of the moles of zirconium element to the sum of the moles of zirconium element and yttrium element is 2at%) (the particle size of the powder is 50-500nm ) was dry pressed and formed by 70MPa cold isostatic pressing; then the formed mixed powder was put into a muffle furnace, and the temperature was raised to 1400°C at a heating rate of 20°C / min; then the temperature was immediately lowered to 900°C and kept for 40 Hour. Then place the heat-preserved mixed powder in a vacuum sintering furnace for sintering at 1700° C. for 10 hours. In the prepared yttrium oxide-based transparent ceramics, its chemical formula is Y 1.96 Zr 0.04 o 3 .

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Abstract

The invention belongs to the field of ceramic material preparation, in particular relates to a sintering method of yttrium oxide base transparent ceramic. The method of the invention includes the following steps: mixed powder after cold isostatic pressing moulding is heated to 1200-1600 DEG C and then instantly cooled to 350-800 DEG C, heat preservation is carried out, and finally the mixed powder after heat preservation is sintered under vacuum for 2-10 hours. The sintering method of the invention utilizes special sintering performance of nano powder, firstly treatment at low temperature (about 40% of melting-point) is carried out, so that sample is densified (reaching about 90% of theoretical density) while grain growth is effectively controlled, and warming sintering is further carried out under vacuum to obtain micro crystal transparent ceramic. The sintering method of the invention can effectively control grain growth in sintering process and is benefit for air hole exhaust, and sintering sample has favourable transmission without annealing treatment. The sintering method of the invention also has the characteristics of lower cost and easy operation.

Description

[0001] technical field [0002] The invention belongs to the field of preparation of ceramic materials, and in particular relates to a sintering method of yttrium oxide-based transparent ceramics. Background technique [0003] Transparent ceramics not only have light transmission like glass, but also have excellent properties such as high temperature resistance, corrosion resistance, and high strength of ceramics. Transparent ceramics have broad application prospects in energy, medical imaging, laser weapons, and exploration. High-performance transparent ceramics are an important frontier direction of research and application in the current material field. [0004] Ceramics are generally opaque because impurities and pores inside the ceramic form a large number of scattering centers and make them opaque. But for some special materials with cubic phase structure, such as yttrium oxide, magnesium oxide, etc., once the internal impurities and pores are completely removed, these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/64C04B35/505
Inventor 黄毅华江东亮张景贤林庆玲黄政仁
Owner 江苏先进无机材料研究院
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