A spherical Ti-based powder and a manufacturing method therefor are provided. The spherical Ti-based powder has a 50% particle size (D50) of 1 to 250 μm in a cumulative particle size distribution based on volume, in which a total amount of oxygen and hydrogen is less than 3000 ppm by mass, an area defect rate in a cross-section of the spherical Ti-based powder is less than 0.100%, and an area circularity of the spherical Ti-based powder in a secondary projection image is 0.90 or more. The spherical Ti-based powder can be obtained by subjecting a pulverized Ti-based powder to a fusion and solidification treatment using a thermal plasma in which a flow rate of hydrogen gas as a working gas is adjusted to less than 0.3 l/min.

An α+β titanium alloy extruded shape containing, in mass %, Al: 5.5 to 6.8%, V: 3.5 to 5.8%, and Fe: over 0 to 0.30%, the balance being Ti and impurities, the impurities amounting to a total of 0.4% or less, the alloy including an acicular microstructure in which an average prior β grain size is 250 μm or less.

An α+β titanium alloy extruded shape containing, in mass %, Al: 5.5 to 6.8%, V: 3.5 to 5.8%, and Fe: over 0 to 0.30%, the balance being Ti and impurities, the impurities amounting to a total of 0.4% or less, the alloy including an acicular microstructure in which an average prior β grain size is 250 μm or less.

This invention discloses a boron-containing titanium-based composite powder for 3D printing, consisting of 0.5%-2% by weight of titanium diboride and 98%-99.5% by weight of titanium sponge. The invention further discloses a method of preparing such composite powder, where the element boron is introduced to the titanium powder through rapid solidification, which significantly improves the solid solubility of boron in Ti, enabling the introduction of part of the boron into the titanium matrix to form supersaturated solid solutions. The reinforcement phase TiB in the boron-containing titanium-based composite powder prepared herein can be precisely controlled in grain size ranging from the nanometer scale to the micrometer scale through temperature or energy density, thereby preparing the titanium-based composite materials with different sizes of reinforcement phases to meet different mechanical requirements.

The present invention relates to the field of medical titanium alloy materials, and in particular, to a narrow-diameter high-strength implant-specific medical titanium alloy achieving immediate implant placement and a preparation method for the implant-specific medical titanium alloy. The medical titanium alloy is prepared from the following chemical components (by weight percentage), 14%-17% of Zr, 3.0%-10% of Cu, and the balance of Ti. The preparation method for the medical titanium alloy comprises: after cogging and forging and before rolling, performing heat preservation for 0.5-6 h at the temperature of 900-1200° C., and water cooling to the room temperature; and rolling at the temperature of 720-850° C., a strain rate being larger than 0.1 s-1, and a barstock obtained after rolling being used for subsequent implant processing. According to the narrow-diameter high-strength implant-specific medical titanium alloy achieving immediate implant placement provided in the present invention, immediate implant placement can be achieved without any surface treatment, and a firm combination of the implant and a bone tissue is achieved. According to the preparation method for the medical titanium alloy provided in the present invention, the implant having a narrow diameter (3.0-3.5 mm) can be prepared and is high in strength, and the purpose of firm implanting on a narrow teethridge missing a tooth is achieved.

The present invention relates to the field of medical titanium alloy materials, and in particular, to a narrow-diameter high-strength implant-specific medical titanium alloy achieving immediate implant placement and a preparation method for the implant-specific medical titanium alloy. The medical titanium alloy is prepared from the following chemical components (by weight percentage), 14%-17% of Zr, 3.0%-10% of Cu, and the balance of Ti. The preparation method for the medical titanium alloy comprises: after cogging and forging and before rolling, performing heat preservation for 0.5-6 h at the temperature of 900-1200° C., and water cooling to the room temperature; and rolling at the temperature of 720-850° C., a strain rate being larger than 0.1 s-1, and a barstock obtained after rolling being used for subsequent implant processing. According to the narrow-diameter high-strength implant-specific medical titanium alloy achieving immediate implant placement provided in the present invention, immediate implant placement can be achieved without any surface treatment, and a firm combination of the implant and a bone tissue is achieved. According to the preparation method for the medical titanium alloy provided in the present invention, the implant having a narrow diameter (3.0-3.5 mm) can be prepared and is high in strength, and the purpose of firm implanting on a narrow teethridge missing a tooth is achieved.

A ball for a ball valve, wherein the ball comprises a substrate of metal having surface modified portions to act as seating surfaces for a seat of the ball valve; and a seat ring for a ball valve, wherein the seat ring comprises a substrate of metal having a surface modified portion to act as a seating surface for a ball of the ball valve.

In a method for preparing a gradient hardened titanium alloy. A steel momentum block and a cleaned titanium alloy plate are sequentially placed into a steel base with a through hole from bottom to top, a cross sectional size of the through hole is matched with cross sectional sizes of the steel momentum block and the titanium alloy plate, and a height of the through hole is matched with a total thickness of the steel momentum block and the titanium alloy plate. An explosive frame is fixed on a top edge of the steel base, a high explosion velocity explosive with an explosion velocity of 7000 m/s or more pressed into a plate-shaped structure is placed in the explosive frame, and detonation is caused at one end of a top surface of the explosive to perform impact treatment on the titanium alloy plate, thereby obtaining the gradient hardened titanium alloy.

In a method for preparing a gradient hardened titanium alloy. A steel momentum block and a cleaned titanium alloy plate are sequentially placed into a steel base with a through hole from bottom to top, a cross sectional size of the through hole is matched with cross sectional sizes of the steel momentum block and the titanium alloy plate, and a height of the through hole is matched with a total thickness of the steel momentum block and the titanium alloy plate. An explosive frame is fixed on a top edge of the steel base, a high explosion velocity explosive with an explosion velocity of 7000 m/s or more pressed into a plate-shaped structure is placed in the explosive frame, and detonation is caused at one end of a top surface of the explosive to perform impact treatment on the titanium alloy plate, thereby obtaining the gradient hardened titanium alloy.

A heat-resistant alloy contains at least one element selected from a group consisting of Al, Ti, Ni, Cr, and Mo, O, and Y, and a ratio of a content of Y in terms of mass to a content of O in terms of mass is 0.5 or greater and 100 or less.