KR100250089B1 - Manufacturing method of ore components for ceramic picture - Google Patents

Manufacturing method of ore components for ceramic picture Download PDF

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KR100250089B1
KR100250089B1 KR1019960065285A KR19960065285A KR100250089B1 KR 100250089 B1 KR100250089 B1 KR 100250089B1 KR 1019960065285 A KR1019960065285 A KR 1019960065285A KR 19960065285 A KR19960065285 A KR 19960065285A KR 100250089 B1 KR100250089 B1 KR 100250089B1
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inner furnace
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KR19980046870A (en
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김제이슨
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김보경
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/6261—Milling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
    • C04B35/62675—Thermal treatment of powders or mixtures thereof other than sintering characterised by the treatment temperature
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/0072—Heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5024—Silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
    • C04B2235/661—Multi-step sintering
    • C04B2235/662—Annealing after sintering

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

구리로 된 내부로(6)내에 옥석, 맥반석, 게르마늄석, 마노석, 수정석을 통상의 분쇄기로 약 300메시로 각기 분쇄하여 각기 20%씩 장입한 다음 직경 5~10cm 크기로 분쇄한 게르마늄석(4)을 상기 내부로(6)의 좌측에 내부로(6)의 깊이만큼 형성하고, 이와 마찬가지로 내부로(6) 우측에 맥반석(5)을 장입하고, 상기 층(5, 6) 밑에 깊이 30~100cm의 황토층(3)을 형성하고 황토층(3) 밑에는 깊이 약 1m의 참숯층(2)을 형성하고, 참숯층(2) 밑에는 깊이 약 1~1.5m의 고령토층(1)을 형성한 다음 상기 고령토층(1) 밑에서 약 750~800℃로 20~24시간 가열 및 서냉을 3회 반복한 후 상기 내부로(6)내의 열변성된 광석분을 다시 약 325메시 이상으로 분쇄한 세라믹 사진 제작용 광석분과 상기 광석분을 공지의 세라믹 사진 표면에 0.1~1.0mm 도포하여 약 1,000℃ 이상에서 3~4시간 열처리한 세라믹 사진.Inside the copper furnace (6), calcite, ganban stone, germanium stone, agate stone, and quartz stone were crushed in a normal grinder at about 300 mesh, charged 20% each, and then crushed to a size of 5 to 10 cm in diameter. (4) is formed on the left side of the inner furnace 6 to the depth of the inner furnace 6, likewise charged with the elvan rock (5) on the right side of the inner furnace 6, and deep below the layers (5, 6) 30 ~ 100cm of ocher layer (3) is formed and under the ocher layer (3) forms a charcoal layer (2) of about 1m depth, and under the charcoal layer (2) a kaolin layer (1) having a depth of about 1 ~ 1.5m After forming and repeating the heating and slow cooling three times for 20 to 24 hours at about 750 ~ 800 ℃ under the kaolin layer (1) and then the heat-modified ore powder in the inner furnace (6) again pulverized to about 325 mesh or more Ore powder for ceramic photo production and the ceramic powder is 0.1 to 1.0mm coated on the surface of the known ceramic photo and heat-treated at about 1,000 ℃ or more for 3 to 4 hours.

Description

영구보존가능한 세라믹 사진제작을 위한 광석분 및 그 세라믹사진Ore powder for permanently preservable ceramic photography and its ceramic photography

본 발명은 영구보존가능한 사진제작을 위한 광석분 및 그 제조방법에 관한 것이다.The present invention relates to an ore powder and a method for producing the same for permanent storage.

통상 카메라로 찍은 사진은 필름을 현상하여 인화지에 인화한 것을 의미하는데 이러한 사진은 탈색, 변색 등으로 인하여 장기보존이 불가능하다.Normally, a photograph taken by a camera means that the film is developed and printed on photo paper, and such a photograph cannot be stored for a long time due to discoloration or discoloration.

미국 등 서양에서는 비석(碑石 : tomb stone) 등에 돌아가신 분의 사진을 붙여 놓는 것이 일상화되어 있다. 그러나 상기한 바와 같이 비석에 붙여 놓은 고인의 사진이 비, 바람, 눈 등의 풍화작용에 의해 오래 보존할 수 없었기 때문에 장기 보존가능한 세라믹 사진(monument picture)에 관한 연구가 계속되어 왔다.In the West, such as the United States, it is common to post pictures of people who have died on tomb stones. However, as described above, since the photograph of the deceased pasted on the monument could not be preserved for a long time due to weathering of rain, wind, snow, etc., studies on ceramic pictures that can be stored for a long time have been continued.

우리나라에서는 전통적으로 산소에 설치하는 비석의 전면에는 돌아가신 분의 성씨와, 배면에는 자손의 이름 등을 글씨로 음각하여 새겨 넣는 것이 대부분이나, 오늘날은 그 비석 전면에는 돌아가신 분의 생전 모습을 담은 사진을 적절히 설치하는 문화가 발달되어 가고 있다.In Korea, the name of the deceased person is engraved on the front of the stele, which is traditionally installed in oxygen, and the names of the descendants are engraved in letters on the back. Today, the front of the headstone is a photograph of the life of the dead. The culture to install appropriately is developing.

이러한 추세는 서양에서 시작되었으나 이미 미국 등에서는 일반화되어 있다.This trend began in the West but is already common in the United States.

비석에 일반사진을 가급적 오래 보존하기 위해 통상 상품명이 "세라믹 사진" 또는 "모뉴멘트 픽쳐(monument picture)"라 불리우는 특수처리한 사진을 붙이는 것이 보통이다.In order to preserve general photographs for as long as possible, it is common to attach specially processed photographs commonly referred to as "ceramic pictures" or "monument pictures".

상기 종래의 세라믹 사진 또는 모뉴멘트 픽쳐는 미국 일리노이주 힐사이드, 힐사이드 애비뉴 15에 소재하는 오우크 파크 세라믹 캄파니 인코포레이티드(Oak Park Ceramic Co., Inc. ; 15 Hillside Avenue, Hillside, Illinois 60162)에서 생산하고 시판하는 것으로서, 상기 세라믹 사진을 제작하는 일반적인 방법을 설명하면, 요구되어지는 크기만큼의 구리판을 준비하고, 상기 구리판을 세라믹 재료로 된 현탁액에 침적하여 기본판(세라믹 타일)을 제작한 후 표면에 콜로디안(collodian) 용액을 도포한 뒤 건조시킨다. 건조 후 중크롬산염, NaCl, 전분 등이 혼합된 용액을 다시 도포한 뒤 약 50~60% 건조시킨 다음 설치하고자 하는 사진의 필름을 그 위에 붙인다.The conventional ceramic photograph or monument picture is Oak Park Ceramic Co., Inc., 15 Hillside Avenue, Hillside, Illinois 60162, Hillside Avenue 15, Hillside, Illinois, USA. In the following, the general method of producing the ceramic photograph is described. The copper plate is prepared in the required size, and the copper plate is immersed in a suspension made of ceramic material to produce a base plate (ceramic tile). After applying a collagen (collodian) solution to the surface and dried. After drying, apply a solution containing a mixture of dichromate, NaCl, and starch, and then dry it by about 50 to 60%, and then attach the film of the picture to be installed on it.

세라믹판 위에 붙인 사진필름표면에 다시 HID(High Intensity Discharge) 광선을 조사하여 상기 판위에 사진의 이미지를 형성하고, 철, 코발트, 망간, 크롬, 알루미늄, 아연 등으로 혼합된 세라믹용 색소가루를 사용하여 색상을 입힌 후 약 700~800℃에서 열처리한다.Irradiating HID (High Intensity Discharge) rays on the surface of the photo film attached on the ceramic plate again to form an image of the photograph on the plate, and using ceramic pigment powder mixed with iron, cobalt, manganese, chromium, aluminum, zinc, etc. After applying the color to heat treatment at about 700 ~ 800 ℃.

상기 과정에 의해 제작된 세라믹 사진은 일반 인화지에 인화된 사진에 비해 수명이 상당히 길어서 대체로 50~100년까지 보존가능하다.The ceramic photograph produced by the above process has a considerably longer life than the photograph printed on general photo paper, and thus can be generally stored for up to 50 to 100 years.

그러나 종래의 세라믹 사진은 종이사진(인화지에 인화한 사진)에 비하여 수명이 장기화 되어지기는 하나 예를 들어, 묘비에 사용하는 경우 묘비는 영구보존되는 것이므로 묘비와 더불어 영구히 보존될 수는 없다.However, conventional ceramic photos have a longer lifespan than paper photographs (photographs printed on photo paper), but, for example, when used in gravestones, the tombstones are permanently preserved.

또한 세라믹판에 이미지를 형성한 후 색상을 재현하는 과정에서 색상이 뚜렷하지 못할 염려가 있는 것이다.In addition, there is a concern that the color may not be clear in the process of reproducing the color after forming the image on the ceramic plate.

따라서 본 발명의 제1목적은 영구보존이 가능한 세라믹 사진을 제작하기 위한 광석분을 제공하는 것이다.Accordingly, a first object of the present invention is to provide an ore powder for producing a ceramic photograph capable of permanent preservation.

본 발명의 제2목적은 상기 광석분의 제조방법을 제공하는 것이다.A second object of the present invention is to provide a method for producing the ore powder.

도 1은 본 발명에 따르는 영구보존용 세라믹 사진제작을 위한 광석분을 제조하는 로를 도시한 개략도.1 is a schematic diagram illustrating a furnace for preparing an ore powder for permanent preservation ceramic photography according to the present invention.

도 2는 본 발명에 따르는 광석분의 제조공정을 도시한 블럭도.Figure 2 is a block diagram showing a manufacturing process of the ore powder according to the present invention.

본 발명에 따르면 상술한 오우크 파크 세라믹 캄파니 인코포레이티드에서 생산한 세라믹 사진에 본 발명의 광석분을 그 표면에 도포한 후 약 750~800℃에서 간헐적으로 6일간 열처리하는 것이다.According to the present invention, the ore powder of the present invention is applied to the surface of the ceramic photograph produced by the aforementioned Oak Park Ceramic Company, Inc., and then heat treated intermittently at about 750 to 800 ° C. for 6 days.

본 발명의 광석분은 옥석 20%, 맥반석 20%, 게르마늄석 20%, 마노석 20%, 수정석 20%를 내부로(6)에 장입하고 고열처리한 다음 초미분쇄한 것이다.The ore powder of the present invention is charged with 20% of boulder, ganban stone 20%, germanium stone 20%, agate stone 20%, quartzite 20% into the furnace 6 and subjected to high heat treatment, followed by ultra grinding.

이하 첨부한 도면을 참조하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도 1을 참조하면 본 발명의 광석분을 제조하기 위한 로는 구리로 된 내부로(6) 좌측에 내부로의 깊이만큼 게르마늄석(4)을 자갈정도 크기(직경 5~10cm)로 분쇄하여 장입하고, 우측에는 좌측과 마찬가지로 맥반석(5)을 장입하고 그 밑에는 두께 30~100cm의 황토층(3)을 마련하고, 그 밑에는 참숯층(2)을 약 1m 깊이로 장입한 다음, 참숯층(2) 밑에 고령토층(1)을 약 1~1.5m 깊이로 마련한다.Referring to Figure 1, the furnace for manufacturing the ore powder of the present invention is charged by grinding the germanium stone (4) to the gravel size (diameter 5 to 10 cm) as much as the depth of the inner to the left of the inner furnace (6) made of copper and On the right side, like the left side, charge the elvan rock (5) and underneath the ocher layer (3) having a thickness of 30 ~ 100cm, underneath the charcoal layer (2) is charged to a depth of about 1m, then the charcoal layer (2) ) Prepare the kaolin layer (1) below about 1 ~ 1.5m deep.

상기 각 층들의 넓이는 내부로(6)의 입구넓이에 대해 5~10배로 하는 것이 바람직하다.The width of each of the layers is preferably 5 to 10 times the width of the inlet of the inner furnace (6).

내부로(6)내에 상기한 광석을 약 300메시로 분쇄하여 상기 비율로 장입하고 내부로(6) 위에 고령토층(1)을 약 1m 정도 두께로 덮은 다음 상기 고령토층(1) 밑에서 전기, 가스 등으로 약 750~800℃ 고열을 가한다. 이 때 가열방법은 20~24시간을 계속 가열한 후 동일시간 동안 서냉시키는 방법으로 3번 반복한다.The ore in the inner furnace 6 is crushed to about 300 mesh and charged at the above ratio, and the kaolin layer 1 is covered with a thickness of about 1 m on the inner furnace 6, and then electricity and gas under the kaolin layer 1 Apply a high temperature of about 750 ~ 800 ℃ with the lamp. At this time, the heating method is repeated three times by continuously heating for 20 to 24 hours and then slowly cooling for the same time.

내부로(6)내에 있는 상기 5종의 광석분은 고열로 인하여 열변성이 일어나고 필요한 물성 등이 강화되어지는데 이에 관련한 상세한 작용은 현재 발명자가 규명하지 못하고 있다.The five ore powders in the interior furnace 6 are thermally denatured due to high heat, and the required physical properties are strengthened. Detailed action related thereto has not been identified by the present inventors.

도 2에 도시한 바와 같이 상기 열변성된 광석분 덩어리를 다시 약 325메시 이상으로 곱게 분쇄한다.As shown in FIG. 2, the thermally denatured ore powder mass is finely crushed to about 325 mesh or more.

상기한 광석분을 상기한 세라믹 사진완성품 표면에 0.1~1.0mm 도포 후 적당한 로에서 약 800℃로 3~10시간 열처리하면 상기 광석분이 융해되어 세라믹 사진 표면에 피막이 형성되고, 이러한 피막은 상기 세라믹 사진의 색상을 보다 분명하게 하는 동시에 경도를 크게 향상시킨다.When the ore powder is applied to the surface of the ceramic photo finished product 0.1 to 1.0 mm and then heat treated at about 800 ° C. for 3 to 10 hours in a suitable furnace, the ore powder is melted to form a film on the ceramic photo surface. Makes the color more clear and improves the hardness.

본 발명에 따른 광석분은 종래의 세라믹 사진의 색상을 보다 선명하게 하고 경도를 향상시켜 통상의 풍화에 약 150년 이상 보존이 가능하게 한다.The ore powder according to the present invention makes the color of the conventional ceramic picture more vivid and improves the hardness, so that it can be preserved for about 150 years in normal weathering.

Claims (2)

구리로 된 내부로(6)내에 옥석, 맥반석, 게르마늄석, 마노석, 수정석을 통상의 분쇄기로 약 300메시로 각기 분쇄하여 각기 20%씩 장입한 다음 직경 5~10cm 크기로 분쇄한 게르마늄석(4)을 상기 내부로(6)의 좌측에 내부로(6)의 깊이만큼 형성하고, 이와 마찬가지로 내부로(6) 우측에 맥반석(5)을 장입하고, 상기 층(5, 6) 밑에 깊이 30~100cm의 황토층(3)을 형성하고 황토층(3) 밑에는 깊이 약 1m의 참숯층(2)을 형성하고, 참숯층(2) 밑에는 깊이 약 1~1.5m의 고령토층(1)을 형성한 다음 상기 고령토층(1) 밑에서 약 750~800℃로 20~24시간 가열 및 서냉을 3회 반복한 후 상기 내부로(6)내의 열변성된 광석분을 다시 약 325메시 이상으로 분쇄한 것을 특징으로 하는 세라믹 사진제작용 광석분.Inside the copper furnace (6), calcite, ganban stone, germanium stone, agate stone, and quartz stone were crushed in a normal grinder at about 300 mesh, charged 20% each, and then crushed to a size of 5 to 10 cm in diameter. (4) is formed on the left side of the inner furnace 6 to the depth of the inner furnace 6, likewise charged with the elvan rock (5) on the right side of the inner furnace 6, and deep below the layers (5, 6) 30 ~ 100cm of ocher layer (3) is formed and under the ocher layer (3) forms a charcoal layer (2) of about 1m depth, and under the charcoal layer (2) a kaolin layer (1) having a depth of about 1 ~ 1.5m After forming and repeating the heating and slow cooling three times for 20 to 24 hours at about 750 ~ 800 ℃ under the kaolin layer (1) and then the heat-modified ore powder in the inner furnace (6) again pulverized to about 325 mesh or more Ceramic photographing ore powder, characterized in that. 구리로 된 내부로(6)내에 옥석, 맥반석, 게르마늄석, 마노석, 수정석을 통상의 분쇄기로 약 200메시로 각기 분쇄하여 각기 20%씩 장입한 다음 직경 5~10cm 크기로 분쇄한 게르마늄석(4)을 상기 내부로(6)의 좌측에 내부로(6)의 깊이만큼 형성하고, 이와 마찬가지로 내부로(6) 우측에 맥반석(5)을 장입하고, 상기 층(5, 6) 밑에 깊이 30~100cm의 황토층(3)을 형성하고 황토층(3) 밑에는 깊이 약 1m의 참숯층(2)을 형성하고, 참숯층(2) 밑에는 깊이 약 1~1.5m의 고령토층(1)을 형성한 다음 상기 고령토층(1) 밑에서 약 750~800℃로 20~24시간 가열 및 서냉을 3회 반복한 후 상기 내부로(6)내의 열변성된 광석분을 로(6)으로부터 꺼내어 다시 약 325메시 이상으로 분쇄한 광석분을 공지의 세라믹 사진 표면에 0.1~1.0mm 도포한 후 약 1,000℃ 이상에서 3~4시간 열처리한 것을 특징으로 하는 세라믹 사진.Germanium stone pulverized in the size of 5 ~ 10cm in diameter by pulverizing gemstone, ganban stone, germanium stone, agate stone, and quartz stone in a copper grinder (6) by using a normal grinder with about 200 mesh and charging 20% each. (4) is formed on the left side of the inner furnace 6 to the depth of the inner furnace 6, likewise charged with the elvan rock (5) on the right side of the inner furnace 6, and deep below the layers (5, 6) 30 ~ 100cm of ocher layer (3) is formed and under the ocher layer (3) forms a charcoal layer (2) of about 1m depth, and under the charcoal layer (2) a kaolin layer (1) having a depth of about 1 ~ 1.5m After forming and repeating the heating and slow cooling for about 20 to 24 hours at about 750 ~ 800 ℃ under the kaolin layer (1) three times, the heat-denatured ore powder in the inner furnace (6) is taken out of the furnace (6) again Cera ore powder pulverized to 325 mesh or more 0.1-1.0mm coated on a known ceramic photo surface and then heat treated at about 1,000 ℃ or more for 3 to 4 hours Photo.
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