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CN-117945748-B - Zirconia composite ceramic and preparation method and application thereof

CN117945748BCN 117945748 BCN117945748 BCN 117945748BCN-117945748-B

Abstract

The application provides zirconia composite ceramic, a preparation method and application thereof, wherein the zirconia composite ceramic comprises 92-99 wt.% of yttrium-stabilized tetragonal zirconia and 1-8 wt.% of titanium-based composite oxide, wherein the molecular general formula of the titanium-based composite oxide comprises Ti (1‑x‑y) M x A y O (2‑x‑0.5y) , x=0 or 0.01-0.1, y=0 or 0.01-0.1, and x and y are not simultaneously 0. The zirconia composite ceramic has high purity of color and strong visual impact, has excellent anti-falling performance, and can be used for providing an electronic equipment shell component with extremely high appearance identification.

Inventors

  • CHEN GE
  • LIN XINPING
  • CHEN JUNCHAO

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260505
Application Date
20221021

Claims (11)

  1. 1. The zirconia composite ceramic is characterized by comprising 93-98 wt.% of yttrium-stabilized tetragonal zirconia and 2-7 wt.% of titanium-based composite oxide, wherein the molecular general formula of the titanium-based composite oxide comprises Ti (1-x-y) M x A y O (2-x-0.5y) , x=0 or 0.01-0.1, y=0 or 0.01-0.1, x and y are not simultaneously 0;M elements comprising at least one of Co, ni and Mn, and the element A comprises at least one of Cr and Al.
  2. 2. The zirconia composite ceramic of claim 1, wherein the zirconia composite ceramic has a color having an L value between 6.51 and 7.35, an a value between 0.04 and 0.23, and a b value between-0.29 and-0.10.
  3. 3. The zirconia composite ceramic of claim 1 wherein the zirconia composite ceramic has a vickers hardness of 1260 or greater Hv.
  4. 4. The zirconia composite ceramic according to claim 1, wherein the yttrium element is contained in the yttrium-stabilized tetragonal phase zirconia in a molar amount of 1.5mol% to 4mol%.
  5. 5. The zirconia composite ceramic of claim 1 wherein the zirconia composite ceramic comprises, by mass, 63.38% to 71.38% of elemental zirconium, 1.88% to 5.41% of elemental yttrium, 0.54% to 4.75% of elemental titanium, 0.006% to 0.59% of a first element, and elemental oxygen, wherein the first element comprises at least one of the M element and the A element.
  6. 6. The zirconia composite ceramic of claim 1 wherein the zirconia composite ceramic comprises, by mass, 64.06 to 70.65% of elemental zirconium, 1.91 to 5.36% of elemental yttrium, 1.08 to 4.16% of elemental titanium, 0.012 to 0.52% of elemental first, and elemental oxygen, wherein the first element comprises at least one of the M element and the A element.
  7. 7. The preparation method of the zirconia composite ceramic is characterized by comprising the following steps: (1) Mixing an M element source and/or an A element source and titanium dioxide, and then performing first sintering treatment to obtain a composite oxide raw material, wherein the molecular general formula of the composite oxide raw material comprises Ti (1-x'-y') M x' A y' O (2-x'-0.5y') , x '=0 or 0.01-0.1, y' =0 or 0.01-0.1, and x 'and y' are not 0 at the same time, the M element comprises at least one of Co, ni and Mn, and the A element comprises at least one of Cr and Al; (2) Mixing yttrium stable tetragonal phase zirconium oxide and the composite oxide raw material, sintering for the first time, cooling, and then crushing and grain size refining in sequence to obtain a precursor material; (3) The precursor material is subjected to granulation, pressing, second sintering and reduction sintering in sequence to obtain zirconia composite ceramic, wherein the zirconia composite ceramic comprises 93-98wt.% of yttrium-stabilized tetragonal zirconia and 2-7wt.% of titanium-based composite oxide, the molecular formula of the titanium-based composite oxide comprises Ti (1-x-y) M x A y O (2-x-0.5y) , x=0 or 0.01-0.1, y=0 or 0.01-0.1, and x and y are not equal to 0 at the same time.
  8. 8. The method of claim 7, wherein the first sintering process is performed at a temperature of 1100 ℃ to 1300 ℃ for a time of 1h to 3 h.
  9. 9. The method according to claim 7, wherein the reducing sintering is carried out under a hydrogen atmosphere at a temperature of 1150-1250 ℃ in the range of 1 h-3 h.
  10. 10. A cover plate comprising the zirconia composite ceramic of any one of claims 1 to 6 or the zirconia composite ceramic produced by the production method of any one of claims 7 to 9.
  11. 11. An electronic device, characterized in that, the electronic device comprising the cover plate of claim 10.

Description

Zirconia composite ceramic and preparation method and application thereof Technical Field The application relates to the technical field of inorganic nonmetallic materials, in particular to zirconia composite ceramic, a preparation method and application thereof. Background Zirconia ceramics are widely used because they have high strength, high hardness, and excellent corrosion resistance at the same time. Especially in the era of blowout of electronic equipment users, the market heat of mobile phones and intelligent wearable equipment with zirconia ceramic shells is higher and higher, and black zirconia ceramic shells are particularly popular. However, the black zirconia ceramics are generally prepared by introducing color oxides such as cobalt oxide into the zirconia ceramics or simply adding titanium dioxide, and the black zirconia ceramics prepared by the method have either insufficient pure color or high cost. Therefore, development of a black zirconia ceramic with high purity of color, good mechanical properties and low production cost is needed. Disclosure of Invention In view of the above, the present application provides a zirconia composite ceramic and a method for preparing the same, which has high color purity, strong visual impact, and excellent anti-drop performance, and can be used for providing electronic equipment housing components with excellent appearance discrimination. The application provides a zirconia composite ceramic, which comprises 92-99 wt.% of yttrium-stabilized tetragonal zirconia and 1-8 wt.% of titanium-based composite oxide, wherein the molecular general formula of the titanium-based composite oxide comprises Ti (1-x-y)MxAyO(2-x-0.5y), x=0 or 0.01-0.1, y=0 or 0.01-0.1, x and y are not simultaneously 0;M elements and comprise at least one of Co, ni, mn, zn, mg, sr, ba and Ca, and the element A comprises at least one of Cr, fe, al, la, er, nd and Yb. Meanwhile, the existence of the titanium-based composite oxide can lead yttrium-stabilized tetragonal zirconia to form oxygen vacancies in sintering, so that the tetragonal zirconia in the composite zirconia ceramic has higher activity, the tetragonal activity of the tetragonal zirconia is improved, and the impact resistance of the zirconia composite ceramic is further improved. Therefore, the zirconia composite ceramic has high purity of color and strong visual impact, has excellent anti-falling performance, and can be used for providing an electronic equipment shell component with excellent appearance identification. The second aspect of the application provides a method for preparing zirconia composite ceramic, comprising the following steps: (1) Mixing an M element source and/or an A element source and titanium dioxide, and then performing first sintering treatment to obtain a composite oxide raw material, wherein the molecular general formula of the composite oxide raw material comprises Ti (1-x'-y')Mx'Ay'O(2-x'-0.5y'), x '=0 or 0.01-0.1, y' =0 or 0.01-0.1, and x 'and y' are not 0 at the same time, the M element comprises at least one of Co, ni, mn, zn, mg, sr, ba and Ca, and the A element comprises at least one of Cr, fe, al, la, er, nd and Yb; (2) Mixing yttrium stable tetragonal phase zirconium oxide and the composite oxide raw material, sintering for the first time, cooling, and then crushing and grain size refining in sequence to obtain a precursor material; (3) The precursor material is subjected to granulation, pressing, second sintering and reduction sintering in sequence to obtain zirconia composite ceramic, wherein the zirconia composite ceramic comprises 92-99 wt.% of yttrium-stabilized tetragonal zirconia and 1-8 wt.% of titanium-based composite oxide, the molecular formula of the titanium-based composite oxide comprises Ti (1-x-y)MxAyO(2-x-0.5y), x=0 or 0.01-0.1, y=0 or 0.01-0.1, and x and y are not equal to 0 at the same time. The preparation method has the advantages of simple steps, high production efficiency and low production cost, and can realize large-scale industrial production. In a third aspect, the present application provides a cover plate comprising the zirconia composite ceramic provided in the first aspect of the present application or the zirconia composite ceramic produced by the production method provided in the second aspect of the present application. The cover plate has the black appearance with high purity and high strength, has good anti-falling performance and can be used for providing electronic equipment with pure black ceramic appearance, and the identification degree and market competitiveness of the electronic equipment can be obviously improved. A fourth aspect of the application provides an electronic device comprising a cover plate provided by the third aspect of the application. The electronic equipment is provided with the cover plate, so that the electronic equipment is high in appearance identification degree and strong in market competitiveness. Detailed Description The embo