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CN-121974688-A - Alumina composite zirconia ceramic ball and preparation method thereof

CN121974688ACN 121974688 ACN121974688 ACN 121974688ACN-121974688-A

Abstract

The invention discloses an alumina composite zirconia ceramic ball and a preparation method thereof, and relates to the technical field of ceramics. The preparation method of the alumina composite zirconia ceramic ball comprises the steps of mixing zirconia, alumina, cerium oxide, yttrium oxide and sodium oxide according to a specific proportion, and adopting wet grinding, spray granulation, rolling forming, sintering and other processes to prepare the alumina composite zirconia ceramic ball. Compared with the prior art, the alumina composite zirconia ceramic ball prepared by the invention improves the hardness of zirconia grinding media, keeps good wear resistance and has excellent ageing resistance, and the problems of high grinding abrasion, high impurity content introduction and short service life of the existing high-hardness materials are solved to a certain extent.

Inventors

  • JIANG TINGTING
  • WANG HENGCHANG
  • MENG DANDAN
  • CHEN HAIBO
  • ZHENG YAN

Assignees

  • 浙江金琨西立锆珠有限公司
  • 浙江金琨锆业有限公司
  • 天台精工西力玻璃珠有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (9)

  1. 1. The alumina composite zirconia ceramic ball is characterized by comprising the following raw materials of zirconia, modified zirconia, alumina, cerium oxide, yttrium oxide and sodium oxide; The preparation method of the modified zirconia comprises the steps of zirconia dispersion acidification treatment, aluminum salt deposition and alkalization aging treatment, adding an additive, introducing a silane coupling agent and a silicon source into an alcohol medium to form precursor composite powder, performing air atmosphere calcination treatment on the precursor composite powder, and performing high-temperature heat treatment under nitrogen/ammonia mixed atmosphere to obtain the modified zirconia; the additive is at least one of YbF 3 、MgAl 2 O 4 .
  2. 2. The alumina composite zirconia ceramic ball of claim 1, wherein the ceramic ball comprises the following raw materials in percentage by mass: 30-40% of zirconia; 30-40% of modified zirconia; 13-23% of alumina; cerium oxide 0.1-5%; 0.1-1% of yttrium oxide; sodium oxide 0.1-1%.
  3. 3. The alumina composite zirconia ceramic ball of claim 1, further comprising a dispersant in an amount of 0.1 to 0.5wt% based on the total amount of solids.
  4. 4. The alumina composite zirconia ceramic ball of claim 1, wherein the dispersant is at least one of polyacrylic acid, ammonium polyacrylate, sodium hexametaphosphate, sodium tripolyphosphate, sodium pyrophosphate, sodium lignin sulfonate, sodium citrate, and sodium dodecyl sulfate.
  5. 5. The alumina composite zirconia ceramic ball of claim 1, wherein: the preparation method of the modified zirconia comprises the following steps: s1, adding zirconium oxide into water, uniformly mixing, adding a dispersing agent, carrying out ultrasonic treatment, and mechanically stirring; S2, adding aluminum nitrate into water, uniformly mixing to obtain an aluminum salt solution, dropwise adding the aluminum salt solution into the mixture obtained in the step S1, uniformly mixing, stirring, adjusting pH, and heating and ageing; S3, adding an additive in the step S2, cooling to 25-35 ℃, adding absolute ethyl alcohol, adding a silane coupling agent, stirring, adding an ethyl orthosilicate ethanol solution, dropwise adding, continuously stirring, centrifuging to obtain precipitate, washing and drying after the reaction is finished to obtain precursor composite powder; S4, placing the obtained precursor composite powder in a muffle furnace in an air atmosphere, and calcining; S5, placing the calcined powder in a tube furnace boat, replacing by N 2 , heating, switching to N 2 、NH 3 mixed gas, cooling to room temperature, and taking out in an inert atmosphere.
  6. 6. The alumina composite zirconia ceramic ball of claim 5, wherein said additive is at least one of YbF 3 、MgAl 2 O 4 .
  7. 7. A method for preparing the alumina composite zirconia ceramic ball according to any one of claims 1 to 6, comprising the steps of: Step 1, adding zirconia, modified zirconia, alumina, cerium oxide, yttrium oxide and sodium oxide into a ball milling tank, adding water to form slurry, wherein the solid content of the slurry is 50-70%, and adding a dispersing agent for wet grinding to ensure that the granularity of the slurry reaches D50<0.2 mu m; step 2, placing the slurry into a granulating tower atomizer for spray granulation; step 3, rolling and forming the granulated powder to obtain grinding medium blanks; Step 4, sintering the green body; and step 5, polishing the sintered ceramic balls to obtain the alumina composite zirconia ceramic balls.
  8. 8. The method for preparing alumina composite zirconia ceramic balls according to claim 7, wherein the rotational speed of the atomizer in the step 2 is 9000-10000r/min, the inlet temperature is 200-250 ℃ and the outlet temperature is 100-120 ℃.
  9. 9. The method for preparing alumina composite zirconia ceramic balls according to claim 7, wherein the sintering temperature in the step 4 is 1350-1400 ℃, and the heat preservation time is 1-3 hours.

Description

Alumina composite zirconia ceramic ball and preparation method thereof Technical Field The invention relates to the technical field of ceramics, in particular to an alumina composite zirconia ceramic ball and a preparation method thereof. Background Zirconia-based ceramic balls have been widely used as grinding media for powder materials for a long time because of their high density, high hardness, good wear resistance, and relatively good chemical stability. In industrial applications, grinding media are usually required to work stably under conditions of high linear velocity, high load, long-term circulation and wet media, and key evaluation indexes thereof generally include density, vickers hardness, abrasion loss and the like, and can be tested and characterized by referring to relevant standards in industrial practice. However, existing zirconia milling media still face several common technical bottlenecks in practical applications. Abrasion of grinding media is unavoidable, so that impurity elements (represented by zirconia abrasion) are introduced into a grinded system, the purity and performance stability of high-purity powder or functional materials are further affected, and particularly in powder grinding scenes such as high-purity zirconium carbide, the zirconia content finally introduced by a belt mill is often used as an important representation mode of abrasion loss. CN110451962a discloses a submillimeter-level zirconia ceramic ball and its preparation method, zirconium oxide and yttrium oxide powder are mixed with anionic dispersant and cationic dispersant respectively, so that the surface activity of yttrium oxide and zirconium oxide is raised, and the combination of the following mixing is facilitated, then the zirconium oxide slurry and yttrium oxide slurry are mixed by adopting solid phase coating, the Y 2O3 with small grain size can uniformly coat the surface of ZrO 2 granules with large grain size, and the 3YSZ powder obtained after spray drying has better stability and small grain size, and has better sintering property, so that the sphericity and compactness of the follow-up submillimeter-level zirconia ceramic ball are ensured. As can be seen from the examples, the particle size of the submillimeter-grade zirconia ceramic balls provided by the invention is 0.4-0.5mm, the volume density is 5.87-5.94g/cm 3, and the abrasion is 0.01087-0.01533 g/(kg.h). The effect is poor and needs to be further improved. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention aims to solve the technical problems of improving the hardness of zirconia grinding media, maintaining good wear resistance, having excellent anti-aging performance, and solving the problems of high grinding abrasion, high impurity content introduction and short service life of the existing high-hardness materials to a certain extent. The invention provides an alumina composite zirconia ceramic ball for achieving the purpose, which is characterized by comprising the following raw materials of zirconia, alumina, cerium oxide, yttrium oxide and sodium oxide. Preferably, an alumina composite zirconia ceramic ball is composed of the following raw materials: 70-80% of zirconia; 13-23% of alumina; cerium oxide 0.1-5%; 0.1-1% of yttrium oxide; sodium oxide 0.1-1%. Wherein the preparation process of the alumina composite zirconia ceramic ball also comprises a dispersing agent, and the adding amount of the dispersing agent is 0.1-0.5wt% of the total solid. Wherein the dispersing agent is at least one of polyacrylic acid, ammonium polyacrylate, sodium hexametaphosphate, sodium tripolyphosphate, sodium pyrophosphate, sodium lignin sulfonate, sodium citrate and sodium dodecyl sulfate. ZrO 2 is used as a matrix, a bearing framework is formed by virtue of high strength and phase change toughening, pores and initial defects are reduced after sintering densification, and crack initiation and fatigue spalling under grinding impact can be reduced. Al 2O3 is used as a high-hardness reinforcing phase, improves the cutting ability of wear-resistant grains, has a certain inhibition effect on grain growth, and ensures that the structure is refined and the wear resistance is more stable. CeO 2 and Y 2O3 cooperate to stabilize ZrO 2 tetragonal phase, and slow down volume expansion and surface roughening caused by t-m phase transition under hydrothermal condition, thereby inhibiting low-temperature aging and abrasion climbing caused by low-temperature aging. Na 2 O mainly plays a role of sintering auxiliary agent to promote interface diffusion and low-temperature densification, but the content and grain boundary distribution of the Na 2 O need to be controlled, so that the hidden danger of water resistance reduction and leaching pollution caused by glass connection passband is avoided. Further preferably, an alumina composite zirconia ceramic ball is composed of the following raw materials: 30-40% of zirconi