Forming method for zirconia ceramic products

Abstract

The invention discloses a forming method for zirconia ceramic products. The forming method comprises the following steps: weighing yttria-stabilized zirconia powder and a surfactant in a ratio, adding ethanol, carrying out ball-milling mixing, drying, and sieving to obtain a slurry; mixing the slurry with a binder, mixing, and granulating to obtain a feedstock for injection, wherein the binder comprises the following components in parts by mass: 60-65 parts of polyethylene glycol, 15-20 parts of oxidizing high-density polyethylene, 15-20 parts of polyvinyl butyral, and 2-3 parts of stearic acid; carrying out injection forming on the feedstock to obtain green bodies; placing the green bodies in water and carrying out water debinding, and carrying out thermal debinding to obtain blanks; sintering the blanks to obtain semi-finished products; and machining and polishing the semi-finished products to obtain the zirconia ceramic products. The forming method for the zirconia ceramic products, which is disclosed by the invention, is capable of guaranteeing that the obtained ceramic products are high in strength, not liable to break, high in compactness, and uniform in porosity.

Description

technical field [0001] The invention relates to the technical field of zirconia ceramics, in particular to a molding method of zirconia ceramic products. Background technique [0002] As a new type of high-tech ceramics, zirconia ceramics have properties such as high strength, high fracture toughness, high hardness, excellent heat insulation performance and high temperature resistance, and are widely used in the fields of structural ceramics and functional ceramics. In addition, zirconia is non-magnetic, non-conductive, non-rusting, and wear-resistant. It is also widely used in the field of biomedical equipment, props, and tools. Recently, partially stabilized zirconia (TZP) can be used to prepare magnetically shielded watch cases, corrosion-resistant watch parts and other instrument parts by powder metallurgy. In addition to the above applications, TZP is also widely used in decoration, life, medicine, piezoelectric ceramics, sensor ceramics and other fields. [0003] The...

AI Technical Summary

Problems solved by technology

Since the pores in the injection-molded green body are completely filled with organic binders, which belong to a closed-pore structure, if the temperature rise rate is too fast during thermal degreasing, the gas products inside the green body cannot be discharged quickly, and the increase in air pressure will lead to cracking and bulging. Defects such as bubbles and deformation

Therefore, thermal degreasing often takes tens of hours, is inefficient, and makes it difficult to manufacture large-scale ceramic products

[0005] At present, the mechanical strength of ceramic products made by injection molding process is average, and there is still a technical demand for further improvement

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