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AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsSeiya Furuta, Kenichi Aota, Kohro Takatsuka, Shigeki Saka, Masahiro Chiji, Masaru Saito
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The invention provides a method for making a novel porous sintered material according to an HIP (Hot Isostatic Press) molding technique usually used for the purpose of obtaining defect-free and highly dense powder products. In the method of the invention, a capsule containing a starting powder in a hermetically sealed condition is heated according to a predetermined temperature pattern and is also subjected to hot isostatic pressing while a pressure is arrived at a maximum pressure level substantially in coincidence with commencement of a sintering temperature-applying period in the temperature pattern and is gradually lowered from the maximum pressure level during the sintering temperature-applying period. By the method, excessive densification is suppressed and the resulting sintered material has a required porosity and is provided with pores open to outside in the inside thereof, along with good strength and surface processability.
A method for making a sintered material which comprises setting a capsule, which contains a starting powder in a hermetically sealed condition, in a pressure-resistant container, and subjecting said capsule to a combination of a treatment wherein said capsule is heated according to a predetermined temperature pattern and a treatment wherein said capsule is subjected to hot isostatic pressing by introducing a pressurized gas into said pressure-resistant container, characterized in that the pressure in said pressure-resistant container is arrived at a maximum level substantially in coincidence with the commencement of a sintering temperature-applying period in the temperature pattern, and the pressure is gradually decreased from the maximum level during the sintering temperature-applying period.
A method for making a sintered material which comprises setting a capsule, which contains a starting powder in a hermetically sealed condition, in a pressure-resistant container, and subjecting said capsule to a combination of a treatment wherein said capsule is heated according to a predetermined temperature pattern and a treatment wherein said capsule is subjected to hot isostatic pressing by introducing a pressurized gas into said pressure-resistant container, characterized in that the pressure in said pressure-resistant container is gradually increased during a sintering temperature-applying period in the temperature pattern, and the pressure is arrived at a maximum pressure level substantially in coincidence with completion of said sintering temperature-applying period.
A method for making a wintered material which comprises setting a capsule, which contains a starting powder in a hermetically sealed condition, in a pressure-resistant container, and subjecting said capsule to a combination of a treatment wherein said capsule is heated according to a predetermined temperature pattern and a treatment wherein said capsule is subjected to hot isostatic pressing by introducing a pressurized gas into said pressure-resistant container, characterized in that said pressurized gas is introduced into said pressure-resistant container in such a way that said pressure in said pressure-resistant container is arrived at a maximum pressure level during a sintering temperature-applying period but delayed by a given time after commencement of said sintering temperature-applying period in said temperature pattern.
A method for making a sintered material which comprises setting a capsule, which contains a starting powder in a hermetically sealed condition, in a pressure-resistant container, and subjecting said capsule to a combination of a treatment wherein said capsule is heated according to a predetermined temperature pattern and a treatment wherein said capsule is subjected to hot isostatic pressing by introducing a pressurized gas into said pressure-resistant container, characterized in that said pressurized gas is introduced into said pressure-resistant container in such a way that said pressure in said pressure-resistant container is arrived at a maximum pressure level prior to commencement of a sintering temperature-applying period in said temperature pattern, and is subsequently lowered to a given sintering pressure before the commencement of said sintering temperature-applying period.
A method for making a sintered material which comprises setting a capsule, which contains a starting powder in a hermetically sealed condition, in a pressure-resistant container, and subjecting said capsule to a combination of a treatment wherein said capsule is heated according to a predetermined temperature pattern and a treatment wherein said capsule is subjected to hot isostatic pressing by introducing a pressurized gas into said pressure-resistant container, characterized in that said metallic powder in said capsule is heated and maintained at a given soaking temperature so that said metallic powder is uniformly heated to the given soaking temperature prior to the introduction of said pressurized gas in said pressure-resistant container, and the pressure in said pressure-resistant container is arrived at a sintering pressure whereby said capsule is subjected to hot isostatic pressing at a given sintering temperature.
Dependencies are inferred from the claim text.