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Zirconia composite alumina ceramic sintered body as well as preparation method and application thereof

A composite alumina and zirconia technology, which is applied in the field of alumina ceramics, can solve the problems of main crystal phase particle growth, phase separation defects, and performance reduction of ZTA composite phase ceramics.

Active Publication Date: 2020-12-29
NANCHONG THREE CIRCLE ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this preparation method is simple in process and low in cost, ZrO always exists 2 Powder in Al 2 o 3 The problem of uneven dispersion and agglomeration in the matrix; mainly manifested in the uneven distribution of the second phase after the main sintering, the abnormal growth of some main crystal phase particles, etc., resulting in over-burning in some areas, residual internal stress between grains, etc. Phase separation defects, which greatly reduce the performance of ZTA composite ceramics

Method used

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  • Zirconia composite alumina ceramic sintered body as well as preparation method and application thereof
  • Zirconia composite alumina ceramic sintered body as well as preparation method and application thereof
  • Zirconia composite alumina ceramic sintered body as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The specific preparation methods of Examples 1-19 and Comparative Examples 1-2 include the following steps: Weigh a certain mixed powder in proportion, add dispersant, adhesive, plasticizer, lubricant to carry out ball milling, defoaming, and then carry out The green body is obtained by tape casting, and the green body is sintered at a high temperature of 1500-1600 ° C. After the end, it is naturally cooled to room temperature with the furnace, and the alumina ceramic substrate is obtained after post-processing.

[0037] The fracture toughness and flexural strength of Examples 1-19 and Comparative Examples 1-2 were measured respectively, and the test results are shown in Table 2. Among them, the fracture toughness test method is: using an electronic universal testing machine, the single edge notched beam method (SENB method) is used to measure the fracture toughness of the composite material by a three-point bending test, and the loading rate is set at 0.05mm / min.

[00...

Embodiment 6

[0043] Embodiment 6 is the best effect of the foregoing embodiments. Cause Analysis: When 3Y-ZrO 2 When the content is low, the amount of tetragonal zirconia that has the effect of phase transformation toughening is small, and the energy absorbed by external force is limited, resulting in poor phase transformation toughening effect. When 3Y-ZrO 2 When the content is high, on the one hand, it is due to the ZrO 2 Uneven distribution in alumina causes uneven microstructure, which causes cracks inside ZTA ceramics; on the other hand, zirconia overlaps and distributes in alumina, with many grain boundaries, and the coefficient of thermal expansion between zirconia and alumina The imbalance leads to poor densification during sintering, which leads to its poor flexural strength.

[0044] It can be seen from Examples 11-19 and Comparative Example 2 that when the content of Ca-Mg-Si flux is changed, the flexural strength and fracture toughness of the alumina-based ceramic substrate ...

Embodiment 14

[0045]Embodiment 14 is the best effect of the foregoing embodiments. Reason analysis: Ca-Mg-Si flux forms a molten glass phase, and the generated glass phase is distributed along the contact interface of each particle, and the atoms fill the pores through liquid diffusion and transmission, and promote sintering densification. When the content of Ca-Mg-Si flux is low, the glass phase formed by melting is limited and cannot completely fill the pores, resulting in insufficient sintering. When the Ca-Mg-Si flux content is high, the excess flux glass phase acts as an "impurity" component and randomly distributes between the alumina grain boundaries, resulting in the inability of the adjacent alumina grains to be tightly bonded, thus causing the ceramic substrate to bend Reduced strength.

[0046] In Examples 5 to 7 and Examples 11 to 16, when the ceramic sintered body contains the following components in mass percentage: 6.65-10.45wt% of zirconium-containing compound (calculated i...

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Abstract

The invention relates to a zirconia composite alumina ceramic sintered body. The zirconia composite alumina ceramic sintered body comprises the following components in percentage by mass: 0.01-19.0 wt% of a zirconium-containing compound (calculated in the form of zirconium oxide), 0.01-1 wt% of a yttrium-containing compound (calculated in the form of yttrium oxide), 0.16-4.6 wt% of a silicon-containing compound (calculated in the form of silicon oxide), 0.035-1.0 wt% of a calcium-containing compound (calculated in the form of calcium oxide), 0.07-2.0 wt% of a magnesium-containing compound (calculated in the form of magnesium oxide) and the balance of aluminum oxide. According to the zirconia composite alumina ceramic sintered body, 3Y-ZrO2 is taken as an additive, and the synergistic effect of multiple toughening modes such as phase change toughening, microcrack toughening, internal crystal structure strengthening toughening and surface strengthening toughening is achieved; CaCO3, SiO2and MgO are used as sintering aids, the sintering temperature of the aluminum oxide ceramic is reduced through liquid-phase sintering, the sintering rate is increased, sintering densification is promoted, and an aluminum oxide substrate prepared from the zirconia composite alumina ceramic sintered body has good fracture toughness and bending strength.

Description

technical field [0001] The invention relates to a zirconia composite alumina (ZTA) ceramic sintered body and a preparation method and application thereof, belonging to the technical field of alumina ceramics. Background technique [0002] ZTA, or Zirconia Toughened Alumina, is a new type of composite ceramic material with alpha alumina as the main crystal phase and metastable and phase-transformable tetragonal zirconia as the strengthening and toughening phase. Among them, zirconia is added to the alumina matrix as an additive to promote the densification of alumina during sintering; or disperse zirconia particles in the alumina matrix, and use zirconia to change from tetragonal phase to monoclinic phase (t→m) The phase change process to improve the comprehensive performance of alumina. The refinement of the toughening mechanism of zirconia to alumina ceramics includes phase transformation toughening, microcrack toughening, internal crystal structure strengthening and tough...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/3244C04B2235/3225C04B2235/3208C04B2235/3206C04B2235/3418
Inventor 陈烁烁江楠孙健
Owner NANCHONG THREE CIRCLE ELECTRONICS
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