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Ceramic heater and manufacturing method thereof, and glow plug using ceramic heater

A technology of ceramic heaters and heating parts, applied in the directions of combustion method, heating element material, heating element shape, etc.

Inactive Publication Date: 2010-06-09
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these demands, since the heating coil is made of metal, packaged heaters have durability issues

Method used

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  • Ceramic heater and manufacturing method thereof, and glow plug using ceramic heater
  • Ceramic heater and manufacturing method thereof, and glow plug using ceramic heater
  • Ceramic heater and manufacturing method thereof, and glow plug using ceramic heater

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0087] First, samples of the green resistor element 200 with the bumps 4 arranged in the green heating portion 231 and samples of the green resistor element 200 without the bumps were injection molded and taken out from the mold. It was checked whether defects such as cracks occurred in the green heating portion 231 of each sample. That is, samples of the green resistor element 200 of the present invention having the protrusions 4 in the green heating portion 231 of the example, and samples of the green resistor element 200 of the comparative example not having the protrusions 4 were produced. . The samples of the present invention were molded by means of molds 51, 61 configured such that in the green heating part 231, the portion P7 of the protrusion 4 was pushed out by the ejector pin T7. The sample of the comparative example was molded by a mold in which the ejector pin was not placed at the position corresponding to the above. Both the sample of the present invention and...

example 2

[0092] Next, a resistor element 3 made of conductive ceramics and having a continuously formed heating portion 31 and a pair of lead portions 33 is embedded in a rod-shaped support 2 made of insulating ceramics to produce such as figure 1 Ceramic heater 1 for samples Nos. 1 to 6 of the configuration shown. Using the ceramic heater 1, a diesel engine for starting and having Figure 7 Glow plug 20 in the configuration shown.

[0093] The insulating ceramic used to construct support 2 is 96.5 (0.89Si 3 N 4 -0.08Er 2 o 3 -0.01V 2 o 5 -0.02WO 3 )-3.5MoSi 2 (weight ratio). The conductive ceramic constructing the resistor element 3 is 70WC / 30Si 3 N 4 -3.96Er 2 o 3 -1.61SiO2 2 (weight ratio).

[0094] The longitudinal cross-sectional shape of the ceramic heater 1 of samples Nos. 1 to 6 is Figure 8 to Figure 10 Three cross-sectional shapes are shown. Samples 1 and 5 have Figure 8 shape shown, samples Nos. 2 and 3 have Figure 9 shape shown, samples Nos. 4 and 6 ha...

example 3

[0115] Next, in order to examine the influence on the resistance (R1) of the resistor element 3, while changing the resistance (R1) of the resistor element 3 by changing the sintering temperature in the range of 1,700 to 1,800°C, the The material and shape of the produced ceramic heater 1 are the same as those of the ceramic heater. At this time, the resistance ( R1 ) of the resistor element 3 is 249 to 478 mΩ. Using this ceramic heater 1, glow plugs 20 of samples Nos. 7 to 10 for starting diesel engines were produced.

[0116] In the glow plug 20 , the energy consumption when the glow plug was heated to 1,250° C., the heating temperature per watt, and the period of time to reach 1,000° C. when 11 V was applied were measured. The results are shown in Table 7.

[0117] [Table 7]

[0118]

[0119]As shown in Table 7, the energy consumption when the glow plugs were heated to 1,250° C. was substantially the same as each other, and the heating temperature per watt was also su...

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Abstract

A ceramic heater which suppresses deterioration of a joining part between a heating part and a lead part and has an excellent reliability. The ceramic heater (1) is provided with a bar-shaped supporting body (2) made of an insulating ceramics, and a resistive element (3). The resistive element is composed of the heating part (31) embedded at the leading edge part of the supporting body (2), and apair of the lead parts (33) extending from the heating part (31) to a rear edge part side of the supporting body (2). The heating part (31) and the lead part (33) are made of the same conductive ceramics.

Description

technical field [0001] The present invention relates to a ceramic heater, a method of manufacturing the ceramic heater, and a glow plug using the ceramic heater, and more particularly, the present invention relates to a glow plug suitable for starting a diesel engine A ceramic heater, a method of manufacturing the ceramic heater, and a glow plug using the ceramic heater. Background technique [0002] Traditionally, a sheath heater in which a heating coil embedded in insulating powder is placed in a cylindrical metal shell with a bottom is used to start a diesel engine. However, in such packaged heaters, thermal conductivity is low, and it takes a long time to increase the temperature since the heating coil is buried in insulating powder. Recently, there is a need to increase the heating temperature of the heater to 1000° C. or higher, and there is a tendency to prolong the afterglow period in which the heater generates heat even after the engine is started. For these deman...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23Q7/00F23Q7/22H05B3/03H05B3/14H05B3/48
Inventor 堀田信行松原桂山元祯广伊藤正也
Owner NGK SPARK PLUG CO LTD
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