Ceramic and preparation method therefor

Patent metadata

Field	Value
Publication number	US-2017327425-A1
Application number	US-201515533563-A
Country	US
Kind code	A1
Filing date	Nov 24, 2015
Priority date	Dec 8, 2014
Publication date	Nov 16, 2017
Grant date	—

Abstract

A ceramic and a preparation method therefor are provided. The ceramic includes a zirconia matrix, and an additive dispersed inside and on an outer surface of the zirconia matrix. The additive is an oxide including elements A and B, where A is selected from at least one of Ca, Sr, Ba, Y, and La, and B is selected from at least one of Cr, Mn, Fe, Co, and Ni.

First claim

1 . A ceramic, comprising:
a zirconia matrix; and an additive, the additive being dispersed inside and on an outer surface of the zirconia matrix, and the additive being an oxide comprising elements A and B; wherein A is selected from at least one of Ca, Sr, Ba, Y, and La, and B is selected from at least one of Cr, Mn, Fe, Co, and Ni.

2 . The ceramic according to claim 1 , wherein a chemical composition of the additive is AxByOz, x, y and z are atomic percentages, and x is approximately 0.5˜2, y is approximately 0.5˜2, and z is approximately 3˜5.

3 . The ceramic according to claim 1 , wherein an average particle size of the additive is approximately 0.5˜10 micrometers.

4 . The ceramic according to claim 3 , wherein the average particle size of the additive is approximately 1˜7 micrometers.

5 . The ceramic according to claim 1 , further comprising:
a sintering aid, wherein the sintering aid is selected from at least one of Ta 2 O 5 , Nb 2 O 5 , CuO, ZnO, and TiO 2 .

6 . The ceramic according to claim 5 , wherein based on a total weight of the zirconia matrix, a content of the sintering aid is approximately 0.1 to 5 weight %.

7 . The ceramic according to claim 1 , wherein based on a total weight of the zirconia matrix, a content of the additive is approximately 1 to 10 weight %.

8 . The ceramic according to claim 1 , wherein toughness of the ceramic is approximately 10 to 12 MPa m 1/2 .

9 . The ceramic according to claim 1 , wherein a number of break-resistance times of the ceramic is 10˜15.

10 . The ceramic according to claim 1 , wherein a red-green value a of the ceramic is approximately 0.06˜0.07, a blue-yellow value b is approximately −0.02˜−0.03, and an intensity L of surface reflection light is approximately 42˜44.

11 . A method for preparing a ceramic, comprising:
(1) mixing zirconia, an additive and an organic solvent, and adding a binding agent into an obtained mixture to obtain a mixed slurry; (2) drying the mixed slurry to obtain a spherical powder; and (3) molding and sintering the spherical powder to obtain the ceramic, wherein the additive is an oxide comprising elements A and B, A is selected from at least one of Ca, Sr, Ba, Y, and La, and B is selected from at least one of Cr, Mn, Fe, Co, and Ni.

12 . The method according to claim 11 , wherein a chemical composition of the additive is AxByOz, x, y and z are atomic percentages, x is approximately 0.5˜2, y is approximately 0.5˜2, and z is approximately 3˜5.

13 . The method according to claim 11 , wherein the additive is prepared by using a following method: mixing at least one of an oxide, a carbonate, a nitrate, and an oxalate comprising the element A with at least one of an oxide, a carbonate, a nitrate, and an oxalate comprising the element B, and sintering an obtained mixture at 900° C.˜1350° C.

14 . The method according to claim 11 , wherein in step (3), a sintering procedure comprises: increasing a temperature from a room temperature to 500° C.˜700° C. in 5 to 7 hours and stabilizing at 500° C.˜700° C. for 1 to 2 hours, increasing the temperature from 500° C.˜700° C. to 900° C.˜1100° C. in 5 to 7 hours and stabilizing at 900° C.˜1100° C. for 1 to 2 hours, increasing the temperature from 900° C.˜1100° C. to 1200° C. in 0.5 to 2 hours and stabilizing at 1200° C. for 1 to 2 hours, increasing the temperature from 1200° C. to 1350° C.˜1450° C. in 2 to 5 hours and stabilizing at 1350° C.˜1450° C. for 3 to 4 hours, cooling the temperature to 900° C. in 2 to 5 hours, and naturally cooling the temperature to the room temperature.

15 . The method according to claim 11 , wherein in step (1), the zirconia, the additive, the organic solvent, and the sintering aid are mixed; and
before the binding agent is added, adding a dispersing agent.

16 . (canceled)

17 . The method according to claim 15 , wherein the dispersing agent is selected from at least one of hydroxypropyl methylcellulose, sodium carboxymethylcellulose, and triethanolamine.

18 . The method according to claim 15 , wherein the sintering aid is selected from at least one of Ta 2 O 5 , Nb 2 O 5 , CuO, ZnO, and TiO 2 .

19 . The method according to claim 14 , wherein based on a total weight of the zirconia, a usage amount of the additive is approximately 1 to 10 weight %;
a usage amount of the sintering aid is approximately 0.1 to 5 weight %; and a usage amount of the binding agent is approximately 0.5 to 1.5 weight %.

20 . (canceled)

21 . (canceled)

22 . The method according to claim 11 , wherein the binding agent is selected from at least one of polyvinyl alcohol and polyethylene glycol 4000.

23 . The method according to claim 22 , wherein the binding agent is a mixture of polyvinyl alcohol and polyethylene glycol 4000, and a molar ratio of the polyvinyl alcohol to the polyethylene glycol 4000 is 1: (1˜2).

24 ˜ 26 . (canceled)

Assignees

• Byd Co Ltd

Inventors

• Gong Qing
• Lin Xinping
• Chen Ge
• Lin Yongzhao
• Wu Bo

Classifications

• C04B2235/3279

  Nickel oxides, nickalates, or oxide-forming salts thereof · CPC title

• C04B2235/604

  Pressing at temperatures other than sintering temperatures · CPC title

• C04B2235/3244

  Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof · CPC title

• C04B2235/528

  Spheres · CPC title

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title