A method of selectively removing at least part of a first phase from a surface of a nanocomposite includes at least a first phase and a second phase, each phase having a respective threshold fluence under a given number of applied laser pulses for removal of the phase by laser ablation. The threshold fluence of the first phase is less than the threshold fluence of the second phase. The method includes irradiating the surface of the nanocomposite with a laser beam having a laser beam diameter, a laser pulse duration, and a laser pulse energy during the irradiation. The laser fluence during the irradiation is less than the threshold fluence of the second phase and greater than the threshold fluence of the first phase. The laser beam diameter is greater than an average grain size of the first phase at the surface of the nanocomposite.

A method of redefining an opening in a composite component comprises filling the opening with a filling material, where the opening is defined in a body of the composite component and opens onto a surface defined by the composite component, and redefining the opening such that the opening extends into the body. Some methods comprise removing an existing coating from the surface of the composite component prior to filling the opening with the filling material and applying a new coating to the surface prior to redefining the opening such that the opening extends through the new coating and into the body. An exemplary composite component comprises a body, a surface with a coating thereon, an original opening defined through the body and filled with a filling material, and a new opening defined through the coating into the body, which may be defined at a new location from the original opening.

An object of the present invention is to provide a novel technique capable of suppressing the occurrence of cracks in an AlN layer.

The present invention is a method for manufacturing an AlN substrate, the method including: an embrittlement processing step S10 of reducing strength of a SiC underlying substrate 10; and a crystal growth step S20 of forming an AlN layer 20 on the SiC underlying substrate 10. In addition, the present invention is a method for suppressing the occurrence of cracks in the AlN layer 20, the method including the embrittlement processing step S10 of reducing the strength of the SiC underlying substrate 10 before forming the AlN layer 20 on the SiC underlying substrate 10.

Provided is a polishing composition that is produced at low cost and can impart high-grade mirror finishing to ceramic. The polishing composition includes abrasives made of carbide, and is used for polishing ceramic.

Provided is a polishing composition that is produced at low cost and can impart high-grade mirror finishing to ceramic. The polishing composition includes abrasives made of carbide, and is used for polishing ceramic.

A sintered body includes a ceramic substrate including sintered oxide particles, a through-hole formed in the ceramic substrate such that the side surfaces of the oxide particles exposed from an inner wall of the through-hole form a flat surface, and a porous body disposed in the through-hole, the porous body including spherical oxide ceramic particles and a mixed oxide configured to bind the spherical oxide ceramic particles.

A sintered body includes a ceramic substrate including sintered oxide particles, a through-hole formed in the ceramic substrate such that the side surfaces of the oxide particles exposed from an inner wall of the through-hole form a flat surface, and a porous body disposed in the through-hole, the porous body including spherical oxide ceramic particles and a mixed oxide configured to bind the spherical oxide ceramic particles.

Provided is a surface treatment method for dental zirconia, which includes sandblasting the surfaces of three types of dental zirconia (3Y-TZP, 4Y-PSZ and 5Y-PSZ) with alumina particles, and when sandblasting conditions are optimized for each type of zirconia, the microstructure destruction of a subsurface layer may be minimized and compressive stress may be reinforced by a phase change, thereby improving mechanical properties, and the penetration of resin cement through microcracks inhibits crack propagation and thus is advantageous in increasing bonding efficiency of dental zirconia. In addition, a dental article including dental zirconia made by the surface treatment method for zirconia, and clinically suitable sandblasting protocols are provided.

Provided is a surface treatment method for dental zirconia, which includes sandblasting the surfaces of three types of dental zirconia (3Y-TZP, 4Y-PSZ and 5Y-PSZ) with alumina particles, and when sandblasting conditions are optimized for each type of zirconia, the microstructure destruction of a subsurface layer may be minimized and compressive stress may be reinforced by a phase change, thereby improving mechanical properties, and the penetration of resin cement through microcracks inhibits crack propagation and thus is advantageous in increasing bonding efficiency of dental zirconia. In addition, a dental article including dental zirconia made by the surface treatment method for zirconia, and clinically suitable sandblasting protocols are provided.

A ceramic composite material and a method for producing same. The ceramic composite material has a ceramic matrix comprising zirconium oxide and at least one secondary phase dispersed therein. The matrix is composed of zirconium oxide as at least 51 vol.-% of composite material, and the secondary phase is in a proportion of 1 to 49 vol.-% of composite material, wherein 90 to 99% of the zirconium oxide is present in the tetragonal phase based on the total zirconium oxide portion. The tetragonal phase of the zirconium oxide is stabilized by at least one member selected from the group consisting of chemical stabilization and mechanical stabilization. The ceramic composite is damage-tolerant.