KR100238556B1 - Reuse of waste ceramic greensheet - Google Patents

Reuse of waste ceramic greensheet Download PDF

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KR100238556B1
KR100238556B1 KR1019970066956A KR19970066956A KR100238556B1 KR 100238556 B1 KR100238556 B1 KR 100238556B1 KR 1019970066956 A KR1019970066956 A KR 1019970066956A KR 19970066956 A KR19970066956 A KR 19970066956A KR 100238556 B1 KR100238556 B1 KR 100238556B1
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green sheet
ceramic green
powder
waste ceramic
waste
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KR19990048300A (en
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박진채
한종수
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명호근
쌍용양회공업주식회사
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62204Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605Treating the starting powders individually or as mixtures
    • C04B35/6261Milling
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/91After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics involving the removal of part of the materials of the treated articles, e.g. etching
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632Organic additives

Abstract

본 발명은 적층형 세라믹 부품을 제조하는 경우에 그 제조과정에서 발생되는 폐 세라믹 그린시트를 재활용하는 방법을 제공하기 위한 것이다.The present invention is to provide a method for recycling the waste ceramic green sheet generated in the manufacturing process when manufacturing a multilayer ceramic component.

종래에는 폐 세라믹 그린시트를 유기 용제에 넣고 유기계 바인더를 녹여 제거한 후 다시 새로운 세라믹 그린시트를 제조한 바 있으나, 유기용제에 유기계 바인더가 녹는데 20시간 이상의 장시간이 소요되고, 불량률이 높으며, 반드시 새로운 원료분말과 혼합하여 사용해야만 재활용이 가능한 단점이 있었다.Conventionally, a new ceramic green sheet was manufactured after the waste ceramic green sheet was put in an organic solvent and the organic binder was dissolved and removed, but the organic binder was dissolved in the organic solvent for 20 hours or longer, and the defect rate was high. There was a drawback to recycling only when used in combination with the raw powder.

본 발명은 이러한 문제를 해결하기 위해, 열처리 방법에 의해 폐 세라믹 그린시트 내에 존재하는 유기물을 제거한 후 이를 분쇄하여 재사용함으로써 재활용에 소요되는 시간이 짧게 걸릴 뿐 아니라 새로운 원재료 분말과 동일한 특성을 가지고 있어 재활용 분말만을 가지고 새로운 세라믹 그린시트를 제조할 수 있는 효과가 있다.In order to solve this problem, the present invention removes the organic matter present in the waste ceramic green sheet by heat treatment, and then crushes and reuses it, which takes a short time to recycle and has the same characteristics as the new raw material powder. It is effective to produce a new ceramic green sheet using only powder.

Description

폐 세라믹 그린시트의 재활용 방법Recycling method of waste ceramic green sheet

본 발명은 폐 세라믹 그린시트 재활용 방법에 관한 것이다. 더욱 상세하게는 세라믹 분말과 유기계 바인더를 혼합하여 제조한 세라믹 그린시트로 적층형 세라믹 부품을 제조하는 과정에서 발생된 폐 세라믹 그린시트를 열처리 방법에 의해 새로운 세라믹 그린시트로 재활용하기 위한 방법에 관한 것이다.The present invention relates to a waste ceramic green sheet recycling method. More particularly, the present invention relates to a method for recycling waste ceramic green sheets generated in a process of manufacturing a multilayer ceramic component using a ceramic green sheet manufactured by mixing ceramic powder and an organic binder into a new ceramic green sheet by a heat treatment method.

최근에 전자부품이 소형화되고 표면 실장화 되면서 칩 형태의 것이 요구되고 있으며, 이러한 칩 형태의 전자부품을 만드는 방법으로 세라믹 그린시트를 적층하여 제조하는 「세라믹 후막 공정법」이 사용되고 있다.Recently, as electronic components have been miniaturized and surface-mounted, a chip type is required. The ceramic thick film process method, which is manufactured by laminating ceramic green sheets, has been used as a method of making such a chip type electronic component.

소형이면서 표면 실장이 가능한 칩 형태의 부품으로 칩 인덕터, 칩 비드, 칩 LC필터, 칩 캐패시터(MLCC), 칩 저항기 등이 있으며, 이중에서 칩 저항기를 제외하고 나머지 모든 부품이 「세라믹 후막 공정법」에 의해 제조되는 것들이다.Chip-type components that are small and can be surface-mounted include chip inductors, chip beads, chip LC filters, chip capacitors (MLCCs), and chip resistors. Are manufactured by.

「세라믹 후막 공정법」은 1005크기(가로1.0㎜ × 세로0.5㎜) 이하의 매우 소형의 칩을 대량으로 생산할 수 있는 장점을 가진 방법이나 공정 중 남게 되는 세라믹 그린시트의 손실이 크다는 것이 한가지 단점이다.One of the disadvantages of the ceramic thick film process is that it has the advantage of producing a very small chip of 1005 size (1.0 mm × 0.5 mm) in a large amount or a large loss of ceramic green sheets left during the process. .

이러한 손실의 감소는 제품원가 절감에 직결되는 중요한 요소인데 그 이유는 원료 분말이 전체 단가에서 차지하는 비중이 20%이상으로 크기 때문이다. 「세라믹 후막 공정법」에서 세라믹 그린시트가 공정 중 남게되는 과정을 설명하면 다음과 같다.This reduction is an important factor directly related to product cost reduction because raw material powder accounts for more than 20% of the total unit price. Referring to the process of leaving the ceramic green sheet in the process in the ceramic thick film process method is as follows.

세라믹 분말과 바인더가 혼합된 슬러리를 테이프 캐스팅(tape casting) 방법(죽 형태의 세라믹을 필름 위에 일정한 두께로 도포하는 방법)에 의해 그린시트를 제조하고 그 윗면 가장자리에 정렬용 구멍을 형성하고, 중앙 부위에는 절단용 점선을 표시하게 되는데 상기 정렬용 구멍을 포함해서 상기 중앙 부위의 점선 밖의 부위는 제품 제조에 직접 사용되는 부분이 아니고 제조방법상 필요한 것으로 실제 사용부분은 상기 중앙 부위의 선 내부 지역이다.Slurry mixed with ceramic powder and binder is produced by tape casting method (coating ceramic in the form of porcelain on film) to make green sheet, and forming a hole for alignment at the top edge. The cut line is marked on the part, and the part outside the dashed part of the center part including the alignment hole is not a part directly used for manufacturing the product, but is required by the manufacturing method. .

따라서, 점선 바깥쪽 부분은 사용되지 않고 버려지게 된다. 이렇게 손실되는 면적은 사용되는 그린시트의 면적에 비해 약 2배를 차지하고 있다.Thus, the portion outside the dashed line is discarded without being used. This lost area occupies about twice the area of the green sheet used.

이러한 문제를 해결하기 위한 기존의 방법에서는 상기 폐 세라믹 그린시트를 재활용하는 방법으로 폐 그린시트를 톨루엔, 아세톤, 메틸에틸케톤(MEK) 등의 유기 용제에 넣어 폐 세라믹 그린시트 내에 존재하는 유기계 바인더를 녹이고, 이것을 슬러리 형태로 다시 만든 다음에 테이프 캐스팅 방법에 의해 새로운 세라믹 그린시트로 제조하는 방법을 이용하고 있다.In order to solve this problem, the conventional method for recycling the waste ceramic green sheet is to put the waste green sheet into an organic solvent such as toluene, acetone, methyl ethyl ketone (MEK) and the like. It melts, re-creates it as a slurry, and then uses a tape casting method to produce a new ceramic green sheet.

이 방법은 유기 용제에 유기계 바인더를 녹이는데 걸리는 시간이 20시간 이상으로 길고, 유기 용제에 장시간 담그어도 녹지 않고, 덩어리가 남게 되는 경우가 많아 세라믹 그린시트 제조 시 불량의 원인으로 작용하게 되는 단점이 있다.This method takes longer than 20 hours to dissolve the organic binder in the organic solvent, does not melt even after immersed in the organic solvent for a long time, and often remains agglomeration, which is a cause of defects in the manufacture of ceramic green sheet have.

따라서 기존의 방법으로 재활용된 세라믹 그린시트 만으로는 새로운 그린시트를 만들 수 없으며, 세라믹 분말과 바인더를 혼합하여 제조한 슬러리에 폐 세라믹 그린시트를 용제에 녹여 재활용된 슬러리 일부(20% 이하)를 섞어야만 사용이 가능하게 된다.Therefore, a new green sheet cannot be made only with the conventionally recycled ceramic green sheets, but a part (20% or less) of the recycled slurry must be mixed by dissolving the waste ceramic green sheets in a solvent. It becomes possible to use.

이러한 단점(미 용융 덩어리에 의한 불량 발생)과 제약조건(새 원료 100중량부에 대해 재활용된 것을 20중량부 이하로 첨가 사용)으로 인해 실제 생산에 적용하는데 많은 문제점을 가지고 있다.Due to these shortcomings (defects caused by unmelted mass) and constraints (recycled amount is added to 20 parts by weight or less based on 100 parts by weight of new raw materials), there are many problems in actual production.

본 발명에서는 종래와 같이 폐 세라믹 그린시트를 유기 용제에 녹임에 따라 생기는 단점 및 제약조건을 해소하기 위한 것으로 열처리에 의해 유기물을 제거하는 방법을 채택함으로써 미용융에 따른 불량률을 감소시키고, 초기 원료 분말과 동일한 특성을 가지며, 저 비용으로 폐 세라믹 그린시트를 다시 재활용할 수 있는 방법을 제공하는데 그 목적이 있다.In the present invention to solve the disadvantages and constraints caused by dissolving the waste ceramic green sheet in the organic solvent as in the prior art by reducing the defect rate due to unmelting by adopting a method of removing the organic material by heat treatment, initial raw material powder Its purpose is to provide a method for recycling waste ceramic green sheets at low cost, which has the same characteristics as the above.

본 발명의 폐 세라믹 그린시트의 재활용 방법은 칩 형태의 전자부품을 제조하고 남은 세라믹 분말과 유기계 바인더로 구성된 폐 세라믹 그린시트를 200℃와 320℃ 사이의 온도에서 5시간 이하의 시간 동안 열처리한 후 분쇄하여서 새로운 세라믹 그린시트로 제조하는데 사용함을 특징으로 한다.The recycling method of the waste ceramic green sheet of the present invention manufactures a chip-shaped electronic component and heat-treats the waste ceramic green sheet composed of the remaining ceramic powder and the organic binder for 5 hours or less at a temperature between 200 ° C and 320 ° C. Pulverized and used to produce a new ceramic green sheet.

즉, 본 발명에 의하면, 칩 형태의 전자부품을 제조하고 남은 세라믹 그린시트를 재활용하기 위해서는 먼저 세라믹 그린시트에 포함된 유기 바인더류를 제거하여야 한다. 이것을 제거하는 방법으로 기존에는 폐 세라믹 그린시트를 유기용제에 넣어 유기계 바인더를 녹여내었으나, 본 발명에서는 폐 세라믹 그린시트를 로(furnace) 내에 넣고, 200℃와 320℃ 사이의 온도에서 5시간 이하의 시간 동안 열처리하여 폐 세라믹 그린시트에 함유되어 있는 유기바인더를 연소시켜 제거하게 된다.That is, according to the present invention, in order to recycle the remaining ceramic green sheet after manufacturing the electronic component in the form of a chip, the organic binders included in the ceramic green sheet must first be removed. In order to remove this, conventionally, the waste ceramic green sheet was put in an organic solvent to melt an organic binder. However, in the present invention, the waste ceramic green sheet is placed in a furnace, and the waste ceramic green sheet is kept in a furnace for 5 hours or less at a temperature between 200 ° C and 320 ° C. The heat treatment is performed for a time to burn and remove the organic binder contained in the waste ceramic green sheet.

상기와 같은 열처리 조작에 의해 유기계 바인더가 제거된 폐 세라믹 그린시트는 분말상으로 만들기 위해 조분쇄용 믹서에 넣고 2 내지 4분간 115내지 125 rpm으로 분쇄를 하고, 이렇게 분쇄된 재활용 분말을 다시 바인더와 혼합하여 슬러리를 제조한 후 테이프 캐스팅 방법에 의해서 다시 새로운 세라믹 그린시트를 제조할 수 있다.The waste ceramic green sheet from which the organic binder is removed by the heat treatment as described above is put in a coarse grinding mixer to make powder, and then pulverized at 115 to 125 rpm for 2 to 4 minutes, and the pulverized recycled powder is mixed with the binder again. After the slurry is prepared, a new ceramic green sheet may be manufactured by a tape casting method.

본 발명에 의한 방법으로 폐 세라믹 그린시트를 재활용할 경우에 다음과 같은 장점이 있다.When recycling the waste ceramic green sheet by the method according to the present invention has the following advantages.

첫째, 기존 방법에 비해 재활용에 걸리는 시간이 작다. 기존 방법은 20시간 이상 소요되나 본 발명에 의한 방법은 열처리에 3 내지 5시간, 분쇄에 2 내지 5분의 시간이 소요된다.First, it takes less time to recycle than conventional methods. The conventional method takes 20 hours or more, but the method according to the present invention takes 3 to 5 hours for heat treatment and 2 to 5 minutes for grinding.

둘째, 재활용된 후 상태가 원재료 분말과 동일하므로 양호한 상태의 세라믹 그린시트를 다시 제조할 수 있다. 기존의 방법의 경우 재활용된 후 상태가 양호하지 못해 원재료에 일부(20중량부 이하)만을 섞어 사용하는 정도만 가능하다.Second, since the state after recycling is the same as the raw material powder, it is possible to manufacture a ceramic green sheet in a good state again. In the case of the existing method, the state is not good after being recycled, and only a part (20 parts by weight or less) of the raw materials can be mixed and used.

셋째, 기존의 방법에 비해 재활용에 요구되는 비용이 재활용에 의해 절감되는 원가절감에 비해 매우 작아 경제성이 우수하다. 즉, 본 발명에 의해 폐 세라믹 그린시트를 재활용할 경우 불량 발생 가능성이 전혀 없을 뿐만 아니라 재활용 비용이 작아 원가절감에 크게 기여할 수 있다.Third, compared to the conventional method, the cost required for recycling is very small compared to the cost savings saved by recycling, and thus the economic efficiency is excellent. That is, when the waste ceramic green sheet is recycled according to the present invention, there is no possibility of defects at all, and the recycling cost is small, which can greatly contribute to cost reduction.

이하 본 발명을 실시예에 의거 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to Examples.

실시예Example

NiCuZn계 페라이트 분말 65중량%와 PVB계 바인더 35중량%가 혼합되어 제조된 세라믹 그린시트 중에서 칩 부품 제조 후에 남은 폐 세라믹 그린시트 1㎏을 회수하고, 이를 칸탈 발열체를 가지는 로 내에 넣고 공기 중에서 200℃의 온도 하에서 3시간 동안 열처리하여 유기계 바인더를 제거하였다. 이를 조분쇄기에 넣고 5분간 분쇄하여 재활용된 분말을 얻었다. 이렇게 하여 얻어진 분말을 원재료 분말과 비교한 결과가 다음 표 1에 나타나 있으며, 두 분말의 평균 입도가 거의 같음을 알 수 있다.In the ceramic green sheet manufactured by mixing 65% by weight of NiCuZn-based ferrite powder and 35% by weight of PVB-based binder, 1 kg of the waste ceramic green sheet remaining after the manufacture of the chip parts was recovered, which was placed in a furnace having a cantal heating element and placed in a furnace at 200 ° C. The organic binder was removed by heat treatment at a temperature of 3 hours. This was put into a coarse mill and milled for 5 minutes to obtain recycled powder. The results obtained by comparing the powder with the raw material powder are shown in Table 1 below, and it can be seen that the average particle sizes of the two powders are almost the same.

상기 과정에 의해 얻어진 재활용 분말 65중량%에 유기계 바인더를 35중량%를 섞어 페라이트 슬러리를 제조하고 테이프 케스팅법으로 새로운 그린시트를 제조하였다. 재활용된 원료에 의해 제조된 그린시트와 원재료에 의해 제조된 그린시트의 물성을 비교한 결과가 다음 표 2에 나타나 있다. 두 가지 경우가 서로 차이가 없이 동일한 수준임을 알 수 있다. 즉, 재활용에 의한 원료를 사용하여도 원재료를 사용하는 것과 차이가 없이 우수한 특성을 발현하였다.65 wt% of the recycled powder obtained by the above process was mixed with 35 wt% of the organic binder to prepare a ferrite slurry, and a new green sheet was prepared by tape casting. The results of comparing the physical properties of the green sheet manufactured by the recycled raw material and the green sheet manufactured by the raw material are shown in Table 2 below. It can be seen that the two cases are at the same level without difference. In other words, even when using recycled raw materials, excellent characteristics were exhibited without difference from using raw materials.

종류Kinds 평균입도(㎛)Average particle size (㎛) 원재료분말Raw material powder 0.750.75 재활용분말Recycled Powder 0.760.76

종류Kinds 인장강도(MPa)Tensile Strength (MPa) 원재료분말에 의한 그린시트Green sheet by raw material powder 3.103.10 재활용분말에 의한 그린시트Green Sheet from Recycled Powder 3.053.05

본 발명은 폐 세라믹 그린시트를 유기 용제에 녹이는 방법 대신에 열처리에 의해 폐 세라믹 그린시트 내부에 존재하는 유기물을 제거한 후 이를 재활용하는 방법으로써 기존 방법을 사용할 때 생기는 미용융에 의한 불량률을 근본적으로 제거할 수 있고, 재활용의 경제성 측면을 고려하여 저온에서 완전히 탈지가 가능한 열처리조건을 선정함으로서 낮은 전기비용으로 그린시트에 포함된 유기 바인더 성분을 제거하고 이후 간단한 분쇄 작업에 의해 원재료와 동일한 분말을 얻을 수 있는 방법이다.The present invention fundamentally eliminates the defect rate caused by unmelting caused by using the existing method as a method of removing organic matter present in the waste ceramic green sheet by heat treatment instead of dissolving the waste ceramic green sheet in an organic solvent. By selecting heat treatment conditions that can be completely degreased at low temperature in consideration of the economical aspect of recycling, the organic binder component included in the green sheet can be removed at low electric cost, and then the same powder as the raw material can be obtained by simple grinding operation. That's how it is.

Claims (1)

칩 형태의 전자부품을 제조하고 남은 세라믹 분말과 유기계 바인더로 구성된 폐 세라믹 그린시트를 200℃와 320℃ 사이의 온도에서 5시간 이하의 시간 동안 열처리한 후 분쇄하여서 새로운 세라믹 그린시트로 제조하는데 사용함을 특징으로 하는 폐 세라믹 그린시트의 재활용 방법.The waste ceramic green sheet composed of the remaining ceramic powder and organic binder after manufacturing the electronic component in the form of a chip is heat-treated at a temperature between 200 ° C and 320 ° C for less than 5 hours and then used to produce a new ceramic green sheet. Recycling method of the waste ceramic green sheet characterized in that.
KR1019970066956A 1997-12-09 1997-12-09 Reuse of waste ceramic greensheet KR100238556B1 (en)

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