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CN-121974684-A - Ceramic, preparation method thereof, appearance structural member and electronic equipment

CN121974684ACN 121974684 ACN121974684 ACN 121974684ACN-121974684-A

Abstract

The embodiment of the application provides ceramic, a preparation method thereof, an appearance structural member and electronic equipment. The ceramic is zirconia-based ceramic, wherein the L value of the ceramic in a Lab color space is 30-60, the a value is 20-30, and the b value is-30 to-60. The ceramic can be dark purple and has a wide color distribution range. The ceramic material can provide an appearance structural member with strong appearance expressive force and good mechanical property, and is selected by a shell of electronic equipment.

Inventors

  • ZHANG YE
  • XU FENG
  • LI QINGMENG
  • RAO ZHIYONG
  • XU JIN

Assignees

  • 华为终端有限公司

Dates

Publication Date
20260505
Application Date
20250121

Claims (20)

  1. 1. The ceramic is zirconia-based ceramic, and in Lab color space, L value is 30-60, a value is 20-30, and b value is-30 to-60.
  2. 2. The ceramic of claim 1, wherein the ceramic is capable of reflecting light having a wavelength of 400nm to 500 nm.
  3. 3. The ceramic according to claim 1 or 2, wherein the ceramic has a transmittance of less than or equal to 5% for 400nm to 800nm light when the ceramic has a thickness of 1 mm.
  4. 4. A ceramic according to any one of claims 1 to 3, wherein the ceramic has a flexural strength of 700 to 1300mpa, a fracture toughness of 6 to 12 mpa-m 1/2 and a vickers hardness of 1100 to 1300hv.
  5. 5. A ceramic according to any one of claims 1 to 3, wherein the ceramic comprises the zirconia and other metal oxides, the other metal oxides comprising a first metal oxide and a second metal oxide; the first metal oxide comprises at least yttrium oxide and erbium oxide, and the second metal oxide comprises aluminum oxide and cobalt oxide, and one or more other transition metal oxides selected from ferric oxide, manganese oxide, chromium oxide, zinc oxide and titanium oxide.
  6. 6. The ceramic of claim 5, wherein the mass of erbium oxide in the ceramic is greater than the sum of the mass of aluminum oxide and the mass of cobalt oxide.
  7. 7. The ceramic according to claim 5 or 6, wherein a mass ratio of the erbium oxide to the yttrium oxide in the ceramic is (1 to 10): 1.
  8. 8. The ceramic according to any one of claims 5 to 7, wherein the ceramic comprises 1 to 3% by mass of alumina, 0.5 to 2% by mass of cobalt oxide, and 0.1 to 2% by mass of other transition metal oxide.
  9. 9. The ceramic according to any one of claims 5 to 8, wherein the mass ratio of yttrium oxide is1 to 4% and the mass ratio of erbium oxide is 1.5 to 20%.
  10. 10. The ceramic of any one of claims 5-9, wherein the first metal oxide further comprises other rare earth oxides, wherein the other rare earth oxides comprise one or more of lanthanum oxide, cerium oxide, samarium oxide, neodymium oxide, ytterbium oxide, and lutetium oxide.
  11. 11. The ceramic according to claim 10, wherein the mass ratio of the other rare earth oxide in the ceramic is 0.5% -3%.
  12. 12. The ceramic according to any one of claims 5 to 11, wherein the zirconia is 66 to 95.9% by mass and the other metal oxides are 4.1 to 34% by mass.
  13. 13. The ceramic of any one of claims 5-12, wherein the sum of the mass fractions of the erbium oxide and the second metal oxide in the ceramic is 3.1% -30%.
  14. 14. The ceramic of any one of claims 1-13, wherein the zirconia comprises tetragonal zirconia and monoclinic zirconia, wherein the tetragonal zirconia has a mass greater than the monoclinic zirconia in the zirconia.
  15. 15. The ceramic according to claim 14, wherein the tetragonal phase zirconia accounts for 85 to 97% by mass of the zirconia, and the monoclinic phase zirconia accounts for 3 to 15% by mass of the zirconia.
  16. 16. A method for preparing a ceramic, comprising: Mixing yttria and erbium oxide co-stabilized zirconia powder with a second metal oxide raw material, or mixing yttria-stabilized zirconia powder, erbium oxide and the second metal oxide raw material, and performing ball milling treatment to obtain a mixed material, wherein the second metal oxide raw material comprises alumina and cobalt oxide, and one or more other transition metal oxides selected from ferric oxide, manganese oxide, chromium oxide, zinc oxide and titanium oxide; And forming the mixed material into a ceramic green body, and sintering the ceramic green body to obtain ceramic, wherein the L value of the ceramic in a Lab color space is 30-60, the a value is 20-30, and the b value is-30 to-60.
  17. 17. The method of claim 16, wherein erbium oxide is further added when mixing the co-stabilized zirconia powder with the second metal oxide raw material.
  18. 18. The method according to claim 16 or 17, wherein the mass percentage of erbium oxide in the ceramics is not more than 8% in the yttrium oxide and erbium oxide co-stabilized zirconia powder.
  19. 19. The method of any one of claims 16-18, wherein one or more other rare earth oxides selected from lanthanum oxide, cerium oxide, samarium oxide, neodymium oxide, ytterbium oxide, and lutetium oxide are also added during the mixing.
  20. 20. An exterior structural member comprising a ceramic according to any one of claims 1 to 15 or a ceramic produced by a method according to any one of claims 16 to 19.

Description

Ceramic, preparation method thereof, appearance structural member and electronic equipment Technical Field The application relates to the technical field of ceramic materials, in particular to a ceramic, a preparation method thereof, an appearance structural member and electronic equipment. Background The purple appearance effect is one of the very popular color effects of the case in electronic devices such as cellular phones, tablet computers, and the like. However, no deep purple ceramic has appeared in the market at present to make the housing of the electronic device. At present, even though purple ceramics are reported, most of the hues are light purple, and the color distribution range is very narrow. Disclosure of Invention In view of the above, the embodiment of the application provides a deep purple ceramic, a preparation method thereof, an appearance structural member and electronic equipment, so as to meet the requirements of a shell of the electronic equipment on the deep purple appearance. The first aspect of the embodiment of the application provides ceramic, wherein the ceramic is zirconia-based ceramic, and in a Lab color space, the L value is 30-60, the a value is 20-30, and the b value is-30 to-60. The ceramic is a zirconia-based ceramic which takes zirconia as a main component, and the ceramic has a small L value and a b absolute value of a negative value in a Lab color space in a proper large range, which indicates that the ceramic is deep purple with a heavy hue, has a wide color distribution range, and can regulate specific hues in a wide range as required to obtain the deep purple with different hues. In the embodiment of the application, the ceramic can reflect light with the wavelength of 400-500 nm. Thus, the ceramic can exhibit an apparent hue of bluish violet or reddish violet. In the embodiment of the application, the transmittance of 400-800 nm light of the ceramic is less than or equal to 5% when the thickness of the ceramic is 1 mm. This may indicate that the ceramic material is substantially opaque in the visible region, is particularly suitable for use as a decorative material, and may be used to achieve shading, color-imparting without the need for an additional shading ink layer. In the embodiment of the application, the bending strength of the ceramic is 700-1300 MPa, the fracture toughness is 6-12 MPa.m 1/2, and the Vickers hardness is 1100-1300 Hv. The ceramic provided by the embodiment of the application has dark purple color, and simultaneously has higher bending strength, good toughness and high hardness, is not easy to bend and deform and break, has good wear resistance and scratch resistance, and can better meet the double requirements of appearance and mechanical properties. In an embodiment of the application, the ceramic comprises zirconia and other metal oxides, including a first metal oxide and a second metal oxide. Wherein the first metal oxide comprises at least yttrium oxide and erbium oxide. The second metal oxide includes aluminum oxide and cobalt oxide, and one or more other transition metal oxides selected from the group consisting of iron oxide, manganese oxide, chromium oxide, zinc oxide, and titanium oxide. The ceramics of the embodiment of the application simultaneously adopts erbium oxide, aluminum oxide, cobalt oxide and other transition metal oxides as the toner of the zirconia-based ceramics, wherein the erbium oxide mainly plays a role in endowing red color, cobalt and aluminum oxide can provide blue color, and other transition metal elements can participate in doped color matching, so that the ceramics obtained by sintering can be made to be in stable dark purple through the cooperative matching of the cobalt and the aluminum oxide, and the requirements of each coordinate value of Lab are met. In addition, the erbium oxide can play a role in stabilizing the tetragonal phase crystal structure of the zirconium oxide with the yttrium oxide, and is favorable for better mechanical properties of ceramics. In some embodiments of the application, the mass of the erbium oxide in the ceramic is greater than the sum of the mass of the aluminum oxide and the cobalt oxide. Thus, the ceramic can be purple instead of blue after being compounded with the erbium element, aluminum and cobalt elements. In some embodiments of the present application, the mass ratio of the erbium oxide to the yttrium oxide in the ceramic is (1-10): 1. Under the condition, the erbium oxide has certain color mixing effect, and the stabilization effect of the zirconium oxide is not reduced and the mechanical reliability of the ceramic is not reduced due to excessive content. In some embodiments of the application, the alumina accounts for 1% -3% of the ceramic by mass. The mass ratio of the cobalt oxide in the ceramic is 0.5% -2%. The mass ratio of the other transition metal oxides in the ceramic is 0.1% -2%. The mass ratio of the cobalt oxide and the aluminum oxide in the ceramic