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Sintered body, light emitting tube and process for manufacturing the same

A manufacturing method and technology of sintered bodies, applied to the manufacture of ships or lead wires, parts of gas discharge lamps, etc., can solve problems such as inapplicability and difficulty in improving productivity

Inactive Publication Date: 2009-04-15
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of a product with a closed structure, since it cannot be released from the mold, it is either not applicable, or it is necessary to provide a core mold to give the inner surface shape as in the investment casting method.
[0004] In particular, for metal halide lamps and high-pressure sodium luminous tubes, it is difficult to improve productivity for products in which the inner diameter of the cylindrical part is smaller than the hole diameter of the end part.

Method used

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  • Sintered body, light emitting tube and process for manufacturing the same
  • Sintered body, light emitting tube and process for manufacturing the same
  • Sintered body, light emitting tube and process for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] In this example, an arc tube as a sintered body was produced. The molded body constituting the sintered body was produced by the following method. That is, 100 parts by weight of alumina powder (trade name alumina AES-11C, manufactured by Sumitomo Chemical Industries, Ltd.) as a raw material powder, 0.025 parts by weight of magnesium, 24 parts by weight of dimethylmalonate as a dispersion medium, 2 parts by weight of Bihejul 3100 (trade name, manufactured by Sumitomo Bioretain Co., Ltd.) as a gelling agent, 1 part by weight of Mariarim AKM0351 (trade name, manufactured by NOF Corporation) as a dispersant, and triethylamine as a catalyst 0.2 parts by weight were mixed and used. This slurry was cast at room temperature in an aluminum alloy mold, and then left to stand at room temperature for 1 hour. Next, it was left to stand at 40° C. for 30 minutes to perform curing and demolding. Furthermore, it was left to stand at each temperature of room temperature and then 90°C...

Embodiment 2

[0129] Example 2 An arc tube as a sintered body was produced. The molded body constituting the sintered body was produced by the following method. That is, 100 parts by weight of alumina powder (trade name Alumina AKP-20, manufactured by Sumitomo Chemical Industries, Ltd.) as a raw material powder, 0.025 parts by weight of magnesium, Chemretsu 6080 (trade name, Hodo Keya Ashland Chemical Co., Ltd.) as a dispersion medium Co., Ltd.) 27 parts by weight, 0.3 parts by weight of ethylene glycol, 4 parts by weight of SBU isocyanate 0775 (trade name, manufactured by Sumitomo Bayer Uletan Co., Ltd.) as a gelling agent, and Mariarim AKM0351 (trade name, manufactured by NOF Corporation) as a dispersant Co., Ltd.) 3 parts by weight and 0.1 parts by weight of Kao Laisha No. 25 (trade name, Kao Corporation) as a catalyst were mixed and used. After casting this slurry into the same mold as in Example 1 at room temperature, it was left to stand at room temperature for 1 hour. Next, it was ...

Embodiment 3

[0134] The sintered body A of Example 3 was produced through the same steps as in Example 2 except that the magnesium in the above-mentioned bonding paste was 0.020 parts by weight. When the thermal shock resistance of the sintered body A of Example 3 was evaluated by the quenching method in water, no cracks occurred in the sintered body A of Example 3 even at 150°C. Further, after the thermal shock resistance evaluation of the sintered body A, when the leakage amount of the cylinder part was measured with a He leakage measuring machine, it was 1×10 -8 atm·cc / second or less. In Example 3, the average grain size of the sintered portion of the molded body was 24.3 μm, and the average grain size near the center of the width direction of the sintered portion of the junction was 47.5 μm. The average crystal grain size was 34.1 μm from the center of the width direction of the sintered portion of the junction to the vicinity of a position 150 μm from one side of the sintered portion...

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Abstract

The present invention provides a sintered body of a joined body including two or more inorganic powder-molded bodies. The sintered body includes first components corresponding to the two or more inorganic powder-molded bodies in the joined body; and a second component corresponding to a junction in the joined body, and has one or both of the features (a) and (b): (a) the second component has a surface roughness equal to or lower than that of each of the first components; and (b) the second component has, in the vicinity of a width center thereof, a transmittance equal to or higher than that of each of the first components.

Description

technical field [0001] The present invention relates to a sintered body in which a plurality of inorganic powder molded bodies are integrated, an arc tube, a manufacturing method thereof, and the like. Background technique [0002] Ceramics, refractory metals, and ceramic / metal composites are usually produced by sintering raw material powders, and the shape of the product is mainly given during molding. However, the difficulty of imparting a shape depends on the molding method. For example, circular plate products are easy to form by mold press molding, but complex-shaped products are formed from blocks by CIP (Cold Isostatic Press), and once formed, they must be shaped by machining. [0003] The gel casting method is a method of manufacturing an inorganic powder molded body by solidifying a liquid slurry containing an inorganic powder through a chemical reaction between organic compounds contained in the slurry. Since the molding die can be copied with high precision, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64H01J9/24H01J61/30
Inventor 吉冈邦彦松本万晃大桥玄章井上正胜伊神俊市渡边敬一郎
Owner NGK INSULATORS LTD