JPS5925189A - Ceramic heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention is a ceramic heater.

Today's ceramic heaters, which are made by embedding sparrows in ceramics, have an H heat discharge of 1.7 J<, and are chemically determined to be female. The equipment is [conveniently used].

However, the rate is generally regarded as a small enemy! Does the ceramic heater, which is made by burying vermilion Suzushima, generate heat when electricity is applied to it? When the engine is closed and started, an extremely large amount of electricity αIC flows.

This is due to the fact that the electrical resistance of metal increases as the temperature rises.
Because of the negative and positive temperature coefficient M, a large difference occurs between the electric power at the time of starting the heater and the electric power in the state of use, which is balanced with the chest temperature.

In addition, since ceramics have a large thermal valley, it takes time to reach the average temperature state VC, and this causes a large starting current to flow while decreasing S1, resulting in fast heating fcy.
It is very suitable for industrial installations such as switches, transformers, etc., but on the other hand, it has to withstand a large amount of overload and soaring power for the installation of switches, transformers, etc. In terms of equipment, the burden on the equipment is greater than that required for installation, and there is a problem in that the pairing of the construction cylinders is shortened.

In other words, with conventional ceramic heaters, an electrical construction with a 'sleep force' corresponding to the start-up is required, and the engineering construction u1m is required.
Or, as a heating length of 1#' for civilian installations, a malfunction occurred due to the power design, and for practical purposes, there was a point A point.

The present invention was developed around 11 vC, and the purpose of this invention is to sharpen the combination ratio by utilizing the solid solution of palladium, platinum, moss, and silver. By controlling the temperature factor, it is possible to change the heating speed by controlling the degree of power rise at the beginning of the first hour, and it is possible to change the heating speed according to the equilibrium power when using a ceramic heater. In addition, Motoyura Akira has developed a ceramic heater that is capable of supporting even the turtle dance. Fully embedded ceramic heater made of alloys of two or more of palladium, platinum, gold, and silver.
ｊ戊 and the internal resistance heating element of the kettle, Moku 1 Yu'
The consistency of the Jl+ coefficient is good, and during firing, the resistance heating element and the ceramic interface are unfavorable, such as a tera water atmosphere or a water-based atmosphere, to prevent gold 4 from becoming overnight. peeling off, deformation and destruction of the ceramic heater substrate,
It is an object of the present invention to provide a cordierite ceramic heater which is highly reliable and has a flat M-value base without causing any breakage of the resistance heating element.

Examples of the present invention will be explained below.

Ceramic heaters are made of ceramics mainly composed of kochiyerite, and a resistor containing the desired =V4 gold-containing M of Teishiki-Oito alloys (silver, sparrow, platinum, palladium) embedded in the ceramics. Consists of a heating element.

The ceramic substrate made of cordierite consists of 35 layers of magnesia, 12 layers of feldspar, 3 parts of alumina powder, 40 pieces of kaolin, and 10 layers of petalite. A blended pulverized product was obtained by mixing and pulverizing, to which was added 40% polyvinyl butyral gold as a binder, and formed into a green sheet with a thickness of 1 mm by kneading and ridge extrusion molding.
Cut into J dimension 125 mm and horizontal dimension 85 mm and dry.

Next, I will explain the entire manufacturing process of the gold paste that will become the resistance heating element. Add the required amount of ethyl cellulose and butycarpitol methacrylate and mix to make base paste. A heating element circuit was printed on the green cordierite sheet using this paster by screen printing, and this was dried at 80° C. for 30 minutes.

This printed raw sheet was overlaid with another unprinted raw sheet and pressed at 200 kg/cmt and 150'C.

After lamination, the same paste as that for the resistive heating element is applied inside the through hole previously opened so as to communicate with the resistive heating element for energization, thereby forming an electrode layer.

The ceramic substrate formed as shown in Jvf was fired for 1 hour at 1300'C in the air using an electric furnace to form a buried nickel film of 3I on the surface of the ceramic substrate using the unfinished nickel method. A cordierite ceramic heater is obtained by brazing nickel as a leader wire at 1000° C. in a frozen atmosphere following the tun 1≠to.

The cordierite ceramic heater made in this manner and the cordierite ceramic heater made of balanoum metal made in exactly the same way were placed in an electric furnace. When the temperature coefficient was determined by (911), the heater made of palladium and gold roe was 3800 M'm%. Platinum, Yamajaku and gold...
eyes, respectively 340ppm, 800ppm, 1
200ppm, 750ppm s720ppm,
It was found that the maximum amount is 300 ppm and 1300 ppm, and the minimum value is also abbreviated. This changes the f% ratio contained in an alloy of two or more of platinum, palladium, firefly, and silver. It was revealed that the temperature coefficient of resistance can be changed freely.

As described above, the present invention includes palladium, white m1. Of the alloys containing two or more of M and Yoei, an alloy of platinum and palladium - excluding bridges, is buried to form the entire resistance heating element, and the alloy containing M is , by changing the false union ratio,
Since it controls the temperature coefficient of electrical resistance, it is possible to reduce the power consumption according to Hirata electric power when using a ceramic 7 heater.
Since it is possible to change the original setting of 1, and also to add (g1 width ipL+ according to necessity by changing the quality guarantee), one industrial song 1- is not a big deal. be.

In addition, regarding the difference in thermal expansion between the four cordierite ceramics and the internal resistor preheated body made of an alloy of two or more of palladium, platinum, gold, and metal, flexible, Not only is the stress alleviated by using the moss during firing, but the reducing atmosphere of neutral or water-filled air to prevent moss oxidation is unpleasant, so it is difficult to react in the oxidation process. Due to changes in electrical resistance and inferiority level,
There is no σJ, and the 1g condylarity is l'L? ] <
, Heat resistant VC crushed ceramic heater? Serve and swallow.

Therefore, the purpose f4 of Qr N) is achieved.

Claims (1)

[Claims] In the ceramic heater, which has a resistive heating element in the form of IJ5C by embedding it in cordierite ceramics, the resistive heating element is white, palladium, gold, and chain.
Of the three or more sparrows that have been mounted, there are 10 and 10 metal pots made of a metal thread alloy made of platinum and palladium, and a metal pot with a 10-IJL resistance heating element. By changing the alloy ratio! llCeramic heater that controls the temperature coefficient of mastication resistance-0