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Valve body for adjusting flow rate of hot gas and method for preparing the same

A flow adjustment valve and flow adjustment technology, applied in the field of adjustment valves, can solve the problems of no dramatic improvement in toughness and oxidation resistance, lack of reliability, and hindrance to practical use, etc.

Inactive Publication Date: 2004-12-29
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, although the above-mentioned materials have excellent high-temperature instantaneous fracture strength and can maintain high-temperature strength, their toughness and oxidation resistance have not improved dramatically, so they are used in harsher environments, especially in high-temperature combustion flames, to generate particle impact, etc. In the case of structural parts, there are problems such as lack of reliability, which hinders practical application

Method used

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  • Valve body for adjusting flow rate of hot gas and method for preparing the same
  • Valve body for adjusting flow rate of hot gas and method for preparing the same
  • Valve body for adjusting flow rate of hot gas and method for preparing the same

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Embodiment 1～3

[0032] In silicon nitride (Si 3 N 4 ) powder (gelatinization rate of 97% or more, purity of 99.7%, average particle diameter of 0.3 μm) is added with a specified amount (mass %) of yttrium oxide (Yttria) shown in Table 1 2 o 3 ) powder (average particle diameter 1.5 μm), and silicon oxide powder (average particle diameter 0.3 μm), using purified water or acetone as a dispersion medium, mixed and stirred in a ball mill lined with silicon carbide ceramics for 24 hours. The amount of purified water or acetone to be added is 120 g relative to 100 g of ceramic full powder raw material.

[0033] Next, the obtained powder is shaped and then sintered. As the forming conditions, press 150 MPa by cold isostatic pressing, form a flat plate of 250 mm × 700 mm × thickness 65 mm, and process it as a blank to obtain two valve bodies with a diameter of φ220 mm × thickness 28 mm. A molded body having a shape of equal major axis diameter φ55 mm x length 220 mm. As the sintering conditions,...

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Abstract

A body of a valve for adjusting the flow rate of a hot gas which is prepared by forming a silicon nitride sintered body; and a method for preparing the body of a valve. The body of a valve is free from the problems associated with a conventional valve for adjusting the flow rate of a hot gas, is excellent in thermal stability and mechanical stability, and exhibits long-term durability.

Description

technical field [0001] The present invention relates to a regulating valve for controlling the flow rate of fluid. Background technique [0002] For example, a valve that adjusts the opening degree by increasing or decreasing the cross-sectional area of ​​the flow path can be used as a flow rate adjustment valve when hot blast gas at 1200° C. or higher is injected from the tuyere of the blast furnace for ironmaking to the blast furnace. In addition, the same flow control valve can also be used in incinerators, chemical equipment, heat exchangers, and gas turbines. The regulating valve controls the flow rate by adjusting the opening degree of the flow path through the rotation or opening and closing of the valve plate in the fluid flow path of the casing made of heat-insulating refractory material or the like. Due to such a structure, in addition to high temperature, the regulating valve is exposed to high-pressure and high-speed fluid for a long time, and at the same time, ...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/591F16K1/22
CPCC04B2235/3418C04B35/584C04B2235/3239C04B2235/5445C04B2235/3878C04B2235/3873C04B2235/3427C04B2235/80C04B2235/767C04B2235/96F16K1/22C04B2235/3895C04B2235/3241C04B2235/3224C04B2235/5436C04B2235/78
Inventor 松林重治野濑哲郎露木明
Owner NIPPON STEEL CORP