KR102112752B1 - Manufacturing Method of Manifold Insulator And Manifold Insulator having engrave-surface grinded like mirror in molten carbonate fuel cell stack - Google Patents

Abstract

The present invention relates to a method for manufacturing a manifold insulator for a molten carbonate fuel cell and a manifold insulator for a molten carbonate fuel cell having a concave portion of a mirror surface manufactured using the same, and more specifically, to be polished to have a mirror surface in the intaglio portion formed on one surface of the insulator. A molten carbonate fuel that can be processed to prevent the phenomenon that the electrolyte from the fuel cell stack flows finely along the surface of the insulator and short-circuits with the manifold by manufacturing a manifold insulator for an applied carbonate fuel cell having a concave portion with a mirror surface. The present invention relates to a method for manufacturing a manifold insulator for a battery and a manifold insulator for a molten carbonate fuel cell having a concave portion of a mirror surface manufactured using the same.

Description

Manufacturing Method of Manifold Insulator for Molten Carbonate Fuel Cell and Manifold Insulator for Manifold Insulator and Manifold Insulator having engrave-surface grinded like mirror in molten carbonate fuel cell stack }

The present invention relates to an insulator for spacing between a molten carbonate fuel cell stack and an external manifold, and more particularly, a method of manufacturing a manifold insulator for a molten carbonate fuel cell for polishing a surface of an insulator having an intaglio portion to have a mirror surface, and It relates to a manifold insulator for a molten carbonate fuel cell having a concave portion of the mirror surface produced using this.

A fuel cell is a device that converts chemical energy stored in hydrocarbons into electrical energy by an electrochemical reaction. At this time, the fuel cell typically includes a cathode and an anode, and while the oxidizing gas passes through the cathode during operation of the fuel cell, the reactant fuel gas operates through the anode, and a plurality of unit cells are arranged in series to achieve a desired output. Dogs can be produced in stacked form.

In general, the fuel cell is a molten carbonate fuel cell (MCFC) operating at high temperature (650 ° C), a phosphate electrolyte fuel cell operating at 180 ~ 200 ° C, and an alkali electrolyte fuel operating at 80 ~ 100 ° C. It is divided into a battery and a polymer electrolyte fuel cell, wherein the molten carbonate fuel cell (MCFC) is lithium-potassium (Li-K) or lithium-sodium (Li-) operating at high temperature (650 ° C). Using molten carbonate made of Na), it has high thermal efficiency, high output per unit cell, and can substitute batteries, and has advantages suitable for continuous operation with high load, and has recently been actively industrialized for power generation.

In this case, in the fuel cell, a through-hole formed to supply and discharge fuel gas and oxidant gas to each unit cell through a single cell is called a manifold, and each type of manifold includes a separate separator. A series of through holes formed in the stacking direction of the perforated through holes as a manifold and an internal manifold form, and a pipe through which gas supplied from the outside flows for supplying gas to the gas flow path are used for the number of separators. There is an external manifold in the form of branching with a corresponding number, the end of which is directly connected to the groove of the separator, and Korean Patent Publication No. 10-2016-0033942 (by the manifold insulator guide pin formed on the fuel cell stack) Combined structure of molten carbonate fuel cell stack and manifold, 2016.03.29.) In the above-described external manifold type fuel cell stack And manifold coupling structures.

In addition, as shown in Figure 1, the molten carbonate fuel cell (MCFC) is a stack of each unit cell 11 composed of a cathode, a separator, and a separator, and a manifold 20 on an outer surface of the fuel cell stack 11. ), Wherein the fuel cell stack 11 has a strong potential, and an electrolyte serving to move an active material inside the fuel cell stack 11 is provided to a manifold 20 made of metal. In order to prevent a short circuit caused by contact, an insulator 100 is provided between the fuel cell stack 11 and the manifold 20, so that the insulator 100 is the fuel cell stack 11 and the manifold 20 ), And insulate from the fuel cell stack (11).

However, referring to Figure 2 (a), even though the fuel cell stack 11 and the manifold 20 are physically separated by the insulator 100, the electrolyte rides on the surface of the insulator 100 There is a problem in that it flows finely and short circuit occurs while contacting the manifold, causing defects and damage to the fuel cell.

Korean Patent Publication No. 10-2016-0033942 (Combined structure of molten carbonate fuel cell stack and manifold by manifold insulator guide pin formed on fuel cell stack, 2016.03.29.)

The present invention has been devised to solve the above-mentioned problems, and is provided between the fuel cell stack and the manifold to prevent the electrolyte from flowing through the surface of the insulator spaced apart between the fuel cell stack and the manifold, a mirror surface It is intended to provide a method of manufacturing a manifold insulator for molten carbonate fuel cells having a surface of.

In addition, the present invention provides a method of manufacturing a manifold insulator for a molten carbonate fuel cell for manufacturing an insulator having a mirror surface in front of an insulator having an intaglio portion, and a manifold insulator for a molten carbonate fuel cell having a concave portion of a mirror surface manufactured using the same. do.

In order to solve the above problems, the present invention provides a method for manufacturing a fuel cell manifold insulator for processing a negative portion of a manifold insulator for a molten carbonate fuel cell to have a mirror surface, the insulator made of a dense ceramic material and the insulator A shape processing preparation step of preparing a grinding tool for processing an intaglio portion, and grinding one surface of the insulator to be formed to have the intaglio portion including a plane and an intaglio surface, wherein the surfaces of the plane and the intaglio surface are from a target dimension (T). Shape processing step of grinding to be preserved by a certain thickness (t1, t2), preparation preparation step of preparing a polishing wheel for polishing the surface of the engraved portion and a slurry containing diamond abrasive grains of a specific size, engraved in the prepared slurry Impregnation step of impregnating the additionally formed insulator, the lead to the tip of the intaglio portion By rotating the polishing wheel arranged to place the wheel Tange and the grinding wheel is characterized in that it comprises a step of polishing the surface of the concave portion processed to have a mirror surface.

In addition, in the shape processing preparation step, the insulator is made of a ceramic material having a porosity of 0.1% or less.

In addition, in the shape processing step, the thickness t2 of the intaglio surface from the target dimension T is characterized in that it is processed to have a thickness less than the thickness t1 of the plane from the target dimension T.

In addition, the thickness t2 of the intaglio surface from the target dimension T is characterized in that it is processed to have a thickness 30 to 40% less than the thickness t1 of the plane from the target dimension T.

In addition, the shape processing step, the first grinding step of grinding the surface of the insulator using a grinding tool made of diamond abrasive particles having a particle size of # 20 ~ 350 and grinding of diamond abrasive particles having a particle size of # 400 ~ 600 And a second grinding step of grinding the surface of the insulator using a tool.

In addition, the polishing step may include a lapping step of polishing the surface of the intaglio portion by using a slurry containing 1 to 5% by volume of diamond abrasive particles having a particle size of # 600 to 1000.

In addition, the polishing step may further include, after the lapping step, a polishing step of polishing the surface of the intaglio portion using a slurry containing diamond particles having a particle size of # 6000 to 30000 in a volume ratio of 1 to 5%.

In addition, in the polishing step, the polishing wheel rotates at a rotational speed of 10,000 to 15,000 per minute and is characterized in that the surface of the intaglio portion is processed.

In addition, in the polishing step, the polishing wheel moves at a speed of 5 to 10 mm / min in a direction toward the surface of the intaglio portion and is characterized in that it processes the surface of the intaglio portion.

In addition, the manufacturing method to another aspect of the present invention, while the surface of the intaglio portion while processing the surface of the intaglio portion using the polishing wheel instead of the impregnation step of impregnating the insulator into the slurry, polishing It characterized in that it comprises a liquid injection step.

이하를 갖도록 가공되는 것을 특징으로 한다.In addition, the present invention in the manifold insulator for a molten carbonate fuel cell having a concave portion of the mirror surface manufactured using the method as described above, the insulator has a surface roughness (Ra) of 0.1

It is characterized by being processed to have the following.

The present invention according to the above configuration, it is possible to perform abrasive processing so as to have a mirror surface in the intaglio portion formed on one surface of the insulator has the effect of producing a manifold insulator for an applied carbonate fuel cell having a concave portion of the mirror surface.

In addition, by providing an insulator having a mirror surface between the fuel cell stack and the manifold, there is an advantage in that the electrolyte from the fuel cell stack can be prevented from flowing shortly along the surface of the insulator and the manifold.

이하를 갖는 세라믹 소재의 절연체를 제조할 수 있다.In addition, the surface roughness is 0.1 using the method of manufacturing the manifold insulator for molten carbonate fuel cells of the present invention.

An insulator made of a ceramic material having the following can be produced.

1 is a perspective view showing a molten carbonate fuel cell according to an embodiment of the present invention.
Figure 2 is an exemplary view for explaining the phenomenon that the electrolyte of the fuel cell stack moves on the surface of the insulator.
3 is a view showing an insulator according to an embodiment of the present invention.
Figure 4 is a flow chart showing a method of manufacturing a manifold insulator for a molten carbonate fuel cell according to an embodiment of the present invention.
5 is an exemplary view for explaining a shape processing step according to an embodiment of the present invention.
Figure 6 is an exemplary view showing a polishing process according to an embodiment of the present invention.
7 is a flowchart illustrating a method of manufacturing a manifold insulator for molten carbonate fuel cells according to another embodiment of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains.

Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings.

The accompanying drawings are only examples shown in order to explain the technical spirit of the present invention in more detail, so the technical spirit of the present invention is not limited to the form of the accompanying drawings.

2 is an exemplary view for explaining a phenomenon in which the electrolyte of the fuel cell stack moves on the surface of the insulator, and FIG. 3 is a view showing an insulator according to an embodiment of the present invention, see FIGS. 2 to 3 When the lower surface, the insulator 100 is formed in a shape corresponding to the shape of the fuel cell stack 11 and the manifold 20, and generally the first block of the rod shape extending in the longitudinal direction is up, down, left, right, and 4 sides. The second block 120 and the key 130 that are vertically disposed with the other adjacent first block 110 and vertically formed between the first block 110 and the other adjacent first block 110. ). At this time, the insulator 100 may be formed with an intaglio portion 140 for coupling with the key 130 on one surface of each block, wherein the electrolyte of the fuel cell stack 11 is the intaglio portion 140 ), A creepage phenomenon moving in the direction of the manifold 20 may occur.

)과 상기 절연체(100)의 표면과 전해질 간의 계면장력(

) 및 상기 절연체(100)의 표면과 전해질 간의 표면장력(

)사이의 관계에 따라 상기 절연체(100)의 표면과 전해질의 외표면간의 접촉각도(

, 젖음각)가 결정되게 된다. 이때, 상기 젖음각(

)이 커질 경우, 전해질이 상기 절연체(100)의 표면 위에서 더욱 큰 방울로 형성되어, 더욱 큰 자중을 받아 상기 연료전지 스택(10)의 적층방향으로 흐르게 됨으로써, 상기 절연체(100)의 표면을 따라 이동하는 크리피지 현상이 저하되는 효과가 있다.At this time, in the insulator 100, when the surface has a mirror surface so that the electrolyte does not move along the surface, the wetting angle between the surface of the insulator 100 and the electrolyte becomes large, and the electrolyte flows through the cross section of the leading edge. It can reduce sebum. At this time, the mirror surface refers to the degree of roughness of the surface having a very small value, such as a mirror, wherein the surface roughness (Ra, Surface Roughness) refers to the degree of fine irregularities generated on the surface by processing the surface of the workpiece The expression having a mirror surface does not refer to a surface of a mirror, and may mean that the surface roughness (Ra) on the surface has a very small value like a mirror, and should be interpreted so as not to deviate from the gist of the present invention. will be. In addition, when the surface roughness (Ra) of the insulator 100 according to the creepage phenomenon and the wetting angle is described in more detail, as shown in FIG. 2 (b), an electrolyte is formed on the surface of the insulator 100. When it is settled, the surface tension between the electrolyte and the gas (

) And the interfacial tension between the surface of the insulator 100 and the electrolyte (

) And the surface tension between the surface of the insulator 100 and the electrolyte (

) According to the relationship between the contact angle between the surface of the insulator 100 and the outer surface of the electrolyte (

, Wetting angle). At this time, the wetting angle (

) Becomes larger, the electrolyte is formed into larger droplets on the surface of the insulator 100, receives a larger weight, and flows in the stacking direction of the fuel cell stack 10, thereby following the surface of the insulator 100. There is an effect that the moving creepage phenomenon is lowered.

Equation 1:

)이 감소하게 되어, 상기 젖음각(

)이 커지게 됨에 따라서, 상기 절연체(100)의 표면에 접하는 전해질은 자중의 영향을 더욱 크게 받아 상기 연료전지 스택(10)의 적층방향으로 흐르게 되고, 상기 적층방향과 직교되는 상기 절연체(100)의 이격방향으로 흐르는 전해질의 크리피지 현상을 방지할 수 있다.That is, according to Equation 1 above, when the roughness of the surface of the insulator 100 decreases, the interfacial tension between the surface of the insulator 100 and the electrolyte (

) Decreases, the wetting angle (

As the) becomes larger, the electrolyte contacting the surface of the insulator 100 is more affected by its own weight and flows in the stacking direction of the fuel cell stack 10, and the insulator 100 orthogonal to the stacking direction It is possible to prevent the creepage phenomenon of the electrolyte flowing in the separation direction.

4 is a flowchart illustrating a method of manufacturing a manifold insulator for a molten carbonate fuel cell according to an embodiment of the present invention, and FIG. 5 is an exemplary view for explaining a shape processing step according to an embodiment of the present invention. 6 is an exemplary view showing a polishing process according to an embodiment of the present invention. Referring to FIGS. 4 to 6, the manifold insulator for a fuel cell is processed so that the intaglio portion of the manifold insulator for the molten carbonate fuel cell of the present invention has a mirror surface. The manufacturing method includes the shape processing preparation step (S100), the shape processing step (S200), the polishing processing preparation step (S300), the impregnation step (S400), the polishing wheel placement step (S500), and the polishing processing step (S600). Can be.

The shape preparation step (S100) is a step of preparing a grinding tool 200 for processing the intaglio portion on the insulator and the insulator made of a dense ceramic material, wherein a dense material is used to process the ceramic material into a mirror surface. In the case of ceramics, which are generally called fine ceramics, a dense material having a waste hole or a final surface roughness value after a polishing process according to its precision, preferably, the insulator has a porosity of 0.1% It should be composed of a ceramic material having the following characteristics. At this time, the shape processing preparation step (S100) includes a process of preparing the insulator 100 block made of a ceramic material obtained by performing a granulation-forming-sintering process of a raw material to obtain a ceramic having the above-described characteristics, At this time, the process of forming the ceramic material is generally widely used, and a detailed description thereof will be omitted.

The shape processing step (S200) is a process for molding the insulator 100 block to have an intaglio portion prepared in the shape processing preparation step (S100), by grinding one surface of the insulator 100, the plane 141 and the engraving It is molded to have an intaglio portion 140 including a surface 142, but the surface of the plane 141 and the intaglio surface 142 is preserved by a specific thickness (t1, t2) from the target dimension (T). You can do At this time, while removing the thickness (t1, t2) stored in the shape processing step (S200) through a polishing process, the surface is processed into a surface roughness having a mirror surface, and referring to FIG. 5, in more detail, the block shape The intaglio surface 142 is formed by using the grinding tool 200 on the initial machining surface S0 of the insulator 100, and the first machining surface S1 of the formed insulator 100 is targeted. Grinding is performed to preserve a predetermined thickness (t1, t2) compared to the second machining surface (St). ((A) to (b) of FIG. 6) Afterwards, the first machining surface (S1) is targeted. To the second processing surface (St) to be polished, the insulator 100 having a mirror surface property may be manufactured.

At this time, a portion of the plane of the insulator 100 is processed by applying a high load using a grinding tool, and in the case of the intaglio surface 142, a high load cannot be applied to the machining surface due to the shape characteristics. Therefore, in the shape processing step S200, the thickness t2 of the intaglio surface 142 from the target dimension T is less than the thickness t1 of the plane 141 from the target dimension T. Should be released. That is, in the shape processing step (S200), the thickness t2 of the intaglio surface 142 from the target dimension T is preserved to have a thickness less than the thickness t1 of the plane from the target dimension T. It is preferable to process as much as possible, and more preferably, the thickness t2 of the intaglio surface 142 from the target dimension T is greater than the thickness t1 of the plane 141 from the target dimension T. It can be processed to have a thickness as small as 30-40%. At this time, when the thickness t2 of the intaglio surface 142 from the target dimension T is less than 30% of the thickness t1 of the plane 141 from the target dimension T, polishing During the process, the polishing of the intaglio surface 142 is excessively processed, so that it is more processed than the target dimension T to form a uniform machining surface, and the thickness of the intaglio surface 142 from the target dimension T When (t2) is processed in excess of 40% of the thickness t1 of the plane 141 from the target dimension T, the intaglio surface 142 is not sufficiently polished during the polishing process. There is a problem in that a uniform processing surface cannot be formed by processing less than the dimension T.

In addition, in the shape processing step (S200), the machining surface should be made as uniform as possible to facilitate the polishing process of the surface of the insulator 100. At this time, the shape processing step (S200) includes diamond abrasive grains having a particle size of # 20 to 350. The first grinding step (S210) for grinding the surface of the insulator using the grinding tool 200 made of the grinding tool 200 made of diamond abrasive grains having a particle size of # 400 to 600. A second grinding step of grinding the surface (S220) may be further performed. At this time, the grain size (grain size) refers to the size of the abrasive grain used in the grinding tool 200, and determines the size of the grain size according to the number of abrasive grains passing through the sieve of the unit mesh size, If the size of the abrasive grain used in the first grinding step (S210) is # 20 to 350, it means that an average of 20 to 350 particles pass through the sieve having a mesh size. The mesh (mesh) is preferably based on the KS standard having a size of 1 in ㅧ 1 in. That is, the shape processing step (S200) is a first grinding step (S210) and a unit for grinding the surface of the insulator using a grinding tool 200 made of diamond abrasive grains having a size of 20 to 350 particles per unit mesh. A second grinding step (S220) of grinding the surface of the insulator using a grinding tool 200 made of diamond abrasive particles having a size of 400 to 600 particles per mesh may be further performed.

가 되도록 상기 절연체(100)의 표면을 연삭할 수 있다.In addition, the shape processing step (S200) by performing the two grinding processes before the polishing process step (S600), the first grinding step (S210) and the second grinding step (S220), a more fine abrasive step by step By using it, it is possible to increase the efficiency of grinding and polishing on the surface, and there is an effect of increasing the polishing efficiency in the polishing process step (S600) by forming a more uniform surface in the shape processing (S200), Preferably, in the shape processing step (S200), the surface roughness (Ra) of the insulator 100 is 0.2 to 0.25

The surface of the insulator 100 can be ground so as to be.

At this time, when processing the intaglio portion 140 of the insulator 100 in the shape processing step (S200), using a grinding wheel having a diameter smaller than the target diameter of the intaglio portion 140, the insulator 100 The intaglio portion 140 can be molded by grinding one side of the surface, and the grinding wheel is a variety of grinding that does not deviate from the gist of the present invention, such as a metal bond wheel, a resin bond wheel, a hybrid bond wheel, and an electrodeposition wheel having diamond abrasive grains. You can use the wheel.

The preparation step for polishing (S300) is a step of preparing a polishing slurry 400 having a diamond abrasive grain of a specific size and a polishing wheel 300 for polishing the surface of the intaglio portion 140, the slurry 400 is a liquid material containing diamond abrasive grains having a specific size, as shown in FIG. 6, prepared by filling in a water tank for abrasive processing, and the abrasive wheel 300 rotates in the axial direction In a configuration constituting a cylindrical abrasive tool 300, the abrasive wheel 300 is preferably made of a soft material such as wool, as the smaller abrasive grains are used.

의 표면조도(Ra)를 가지고 있으므로, 상기 절연체(100)의 표면을 더욱 매끄럽게 연마하기 위해서는 상기 연마휠(300)이 더욱 빠른 고속의 회전을 수행하여야하며, 상기 슬러리(400)에 함유된 다이아몬드지립은 더욱 작은 입도를 갖도록 형성되어야 한다. 또한, 상기 슬러리(400)에 상기 절연체(100) 및 상기 연마휠(300)을 함침시켜 연마함으로써, 상기 연마휠(300)의 빠른 회전속도에 따른 상기 연마휠(300)의 과열을 충분히 냉각시킬 수 있는 장점이 있다.The impregnation step (S400) is a step of impregnating the insulator 100 that is shaped into the inside of the slurry 400 filled in the water tank, and the abrasive wheel is applied to the insulator 100 accommodated inside the slurry 400. The surface of the insulator 100 may be polished using diamond abrasives of the slurry 400 that rotates (300) and moves in parallel according to the rotational force of the polishing wheel (300). At this time, in the shape processing step (S200), the insulator 100 is 0.2 to 0.25

Since it has a surface roughness (Ra) of, the polishing wheel 300 must perform faster and faster rotation to more smoothly polish the surface of the insulator 100, and the diamond abrasive grains contained in the slurry 400 Should be formed to have a smaller particle size. In addition, by impregnating and polishing the insulator 100 and the polishing wheel 300 in the slurry 400, the overheating of the polishing wheel 300 according to the high rotational speed of the polishing wheel 300 is sufficiently cooled. There is an advantage.

The polishing wheel placement step (S500) is a step of disposing the polishing wheel 300 on the front end of one surface of the insulator 100, and when the insulator 100 is accommodated in the slurry 400, the polishing wheel (300) In addition, it is preferable that the slurry 400 is impregnated, so that it is disposed on one surface of the insulator 100 so as to be positioned at the tip of the intaglio portion 140, more preferably the abrasive wheel 300 and the The intaglio portion 140 may be arranged to have concentricity.

를 갖도록 하는 것이 바람직하며, 이후 상기 폴리싱단계(S620)에서 상기 절연체(100)의 표면조도(Ra)가 0.1

미만의 값을 갖도록 가공한다.The polishing step (S600) is a step of processing the surface of the intaglio portion 140 to have a mirror surface by rotating the abrasive wheel 300, the intaglio portion 140 in the tank filled with the slurry 400 The surface of the intaglio portion 140 may be polished while moving in the direction toward the surface of the. At this time, the polishing step (S600) is a lapping step (S610) of polishing the surface of the intaglio portion 140 using a slurry 400 containing 1 to 5 vol% of diamond abrasive particles having a particle size of # 600 to 1000. And, after the lapping step (S610), a polishing step (S620) of polishing the surface of the intaglio portion 140 using a slurry 400 containing 1 to 5 vol% of diamond abrasive particles having a particle size of # 6000 to 30000 It may further include. At this time, in the wrapping step (S610), the surface roughness (Ra) of the insulator 100 is 0.1 to 0.15.

It is preferable to have, the surface roughness (Ra) of the insulator 100 in the polishing step (S620) is 0.1

It is processed to have a value less than.

At this time, in the polishing step (S600), the polishing wheel 300 rotates at RPM (revolutions per minute, RPM) of 10,000 ~ 15,000, 5 ~ in the direction toward the surface of the engraving 140 It is preferable to process the surface of the intaglio portion 140 while moving at a speed of 10 mm / min.

7 is a flowchart illustrating a method of manufacturing a manifold insulator for a molten carbonate fuel cell according to another embodiment of the present invention. Referring to FIG. 7, a manifold insulator for a molten carbonate fuel cell according to another embodiment of the present invention In the manufacturing method, instead of the impregnation step (S400) of impregnating the insulator 100 into the slurry 400, while processing the surface of the intaglio portion 140 using the polishing wheel 300, the intaglio portion ( 140) may be performed by including a polishing liquid spraying step (S700) for spraying the slurry 400, wherein the polishing liquid spraying step (S700) is a lapping step (S610) of the polishing processing step (S600). ) Sprays slurry 400 containing 1 to 5 vol% of diamond abrasives having a particle size of # 600 to 1000, and in the polishing step (S620) contains 1 to 5 vol% of diamond abrasives having a particle size of # 6000 to 30000 At the same time as the sprayed slurry 400 is sprayed By pressing the mahwil 300 on the surface of the insulator 100, the surface of the insulator 100 can be polished to have a mirror surface.

The present invention is not limited to the above-described embodiments, and of course, the scope of application is various, and various modifications can be implemented without departing from the gist of the present invention as claimed in the claims.

10: molten carbonate fuel cell stack 11: unit cell
20: manifold
100: insulator 110: first block
120: second block 130: key
140: engraved portion 141: flat
142: engraved surface
200: grinding tool 300: grinding wheel
400: slurry

Claims (11)

In the manufacturing method of a fuel cell manifold insulator for processing so that the intaglio portion of the molten carbonate fuel cell manifold insulator has a mirror surface,
A shape processing preparation step of preparing a grinding tool for processing the intaglio portion on the insulator and the insulator made of a dense ceramic material;
Shape processing to grind one surface of the insulator to have the intaglio portion including the plane and the intaglio surface, but grinding the surface of the plane and the intaglio surface to a specific thickness (t1, t2) from the target dimension (T) step;
A preparation step for preparing a slurry containing a specific size diamond abrasive and a polishing wheel for polishing the surface of the intaglio portion;
An impregnation step of impregnating the prepared insulator with the intaglio portion formed in the slurry;
An abrasive wheel arrangement step of disposing the abrasive wheel at the tip of the intaglio portion of the insulator; And
An abrasive processing step of rotating the abrasive wheel so that the surface of the intaglio portion has a mirror surface;
Method of manufacturing a manifold insulator for a molten carbonate fuel cell having a mirror surface comprising a.
According to claim 1,
In the step of preparing the shape processing, the insulator is a method of manufacturing a manifold insulator for a molten carbonate fuel cell having a mirror surface, characterized in that it is made of a ceramic material having a porosity of 0.1% or less.
According to claim 1,
In the shape processing step, the thickness t2 of the intaglio surface from the target dimension T is processed to have a thickness smaller than the thickness t1 of the plane from the target dimension T. Method for manufacturing a manifold insulator for molten carbonate fuel cells.
According to claim 3,
The thickness t2 of the intaglio surface from the target dimension T is processed to have a thickness of 30 to 40% less than the thickness t1 of the plane from the target dimension T. Method of manufacturing a fold insulator.
According to claim 3,
The shape processing step, a first grinding step of grinding the surface of the insulator using a grinding tool made of diamond abrasive having a particle size of # 20 ~ 350, and
A second grinding step of grinding the surface of the insulator using a grinding tool made of diamond abrasive grains having a particle size of # 400 to 600,
Method of manufacturing a manifold insulator for a molten carbonate fuel cell having a mirror surface comprising a.
According to claim 1,
In the polishing step, a lapping step of polishing the surface of the intaglio portion using a slurry containing diamond particles having a particle size of # 600 to 1000 in a volume ratio of 1 to 5%,
Method of manufacturing a manifold insulator for a molten carbonate fuel cell having a mirror surface comprising a.
The method of claim 6,
After the lapping step, the polishing step is a polishing step of polishing the surface of the intaglio portion by using a slurry containing diamond particles having a particle size of # 6000 to 30000 in a volume ratio of 1 to 5%,
Method of manufacturing a manifold insulator for a molten carbonate fuel cell having a mirror surface further comprising a.
The method of claim 7,
In the polishing step, the polishing wheel is rotated at a rotational speed of 10,000 to 15,000 rpm, and a method of manufacturing a manifold insulator for a molten carbonate fuel cell is characterized by processing the surface of the intaglio portion.
The method of claim 8,
In the polishing step, the polishing wheel moves at a rate of 5 to 10 mm / min in a direction toward the surface of the intaglio portion and processes the surface of the intaglio portion, thereby manufacturing a manifold insulator for a molten carbonate fuel cell.
The method of claim 9,
In the manufacturing method, instead of an impregnation step of impregnating the insulator with the slurry,
A polishing liquid spraying step of spraying a polishing liquid on the surface of the intaglio portion while processing the surface of the intaglio portion using the polishing wheel;
Method for producing a manifold insulator for molten carbonate fuel cells comprising a.
In the manifold insulator for a molten carbonate fuel cell having a concave portion of the mirror surface manufactured by using a method for manufacturing a manifold insulator for any one of the molten carbonate fuel cells selected from claims 1 to 10,
The insulator has a surface roughness (Ra) of 0.1

A manifold insulator for a molten carbonate fuel cell having a concave portion having a mirror surface, which is processed to have the following.

Images