JPS61132564A - Boron nitride normal pressure sintered body - Google Patents
Boron nitride normal pressure sintered bodyInfo
- Publication number
- JPS61132564A JPS61132564A JP59251337A JP25133784A JPS61132564A JP S61132564 A JPS61132564 A JP S61132564A JP 59251337 A JP59251337 A JP 59251337A JP 25133784 A JP25133784 A JP 25133784A JP S61132564 A JPS61132564 A JP S61132564A
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- boron nitride
- normal pressure
- pressure sintered
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Compositions Of Oxide Ceramics (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、高温炉、溶融物を取り扱う工業に用いられる
窒化硼素常圧焼結体に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an atmospheric pressure sintered body of boron nitride used in high temperature furnaces and industries that handle molten materials.
窒化硼素（以下ＢＮと記す）は熱伝導重大、熱膨張率小
、耐食性良好、電気絶縁材料、潤滑性良好、機械加工性
良好、軽量の性質を有する。このため、高温伝熱材料、
電気絶縁材料、潤滑剤として各工業分野に使用されてい
る。しかし、利用分野の広いわりに使用量が飛躍的に増
大しないのは、ＢＮの高価格が一因する。Boron nitride (hereinafter referred to as BN) has the properties of excellent heat conduction, low coefficient of thermal expansion, good corrosion resistance, electrical insulation material, good lubricity, good machinability, and light weight. For this reason, high temperature heat transfer materials,
It is used in various industrial fields as an electrical insulation material and lubricant. However, the high price of BN is one reason why the amount of BN used has not increased dramatically despite its wide range of applications.
価格の高い理由として。As a reason for the high price.
１）ＢＮ粉が高価である ２）焼結体製造（ホットプレス法）が高価である 等があげられる。1) BN powder is expensive 2) Sintered body production (hot press method) is expensive etc. can be mentioned.
ホットプレス法により製造する場合、黒鉛ダイスの材料
費や装置本体が高価で、生産能率が悪いなどがコストア
ップの原因である。When manufacturing by the hot press method, the material cost of the graphite die and the equipment itself are expensive, and the production efficiency is low, which are the causes of the cost increase.
ＢＮ焼結体を現状よりも低価格に製造するには、
ａ）ＢＮ焼結体の特性を低下させない範囲で他の原料を
添加し複合化する
ｂ）ホットプレス法の代りに常圧法を用いることが考え
られる。In order to manufacture BN sintered bodies at a lower cost than the current price, a) Add other raw materials to the BN sintered body to the extent that it does not deteriorate the properties of the BN sintered bodies to make it composite. b) Use the normal pressure method instead of the hot press method. It is possible that
本発明では１．ＢＮの複合剤としてＡ見２０３を選んだ
が、従来のＢＮ−Ａ１２０３系に関係する特許としては
次の■〜■がある。In the present invention, 1. Although Ami 203 was selected as a BN composite agent, the following patents (1) to (2) are related to the conventional BN-A1203 system.
■特開昭４８−９０４７４
組 成： ＢＮ−Ａ見２０３−高ケイ酸ガラス焼結法：
ホットプレス
用 途： 半導体ドープ材
（■特開昭４８−４３６４８
組 成： ＢＮ−Ａ見−５ｋ
焼結法：反応焼結
用 途：高温耐食材料
■特開昭５７−８４４４８〜６４４５０組 成： Ｂ
Ｎ −（Ａｌ１０３ 、 Ｓ＝ ０２ 、Ｍｇ
Ｏの一種）
焼結法：ホットプレス
用 途：細径棒連鋳用鋳型
■特開昭５５−３４６６３
組 成： Ａ１２０３−Ｃ骨材、ＢＮ、Ａｌ２０３．フ
ェノールレジン
焼結法ニラバープレス常圧焼成
用 途：溶鋼用浸漬ノズル
■特開昭５６−１３９２６０〜
組 成： ＢＮ、５ｋ０２黒鉛、Ａｌ２０３、有機バイ
ンダー
焼結法ニラバープレス常圧焼成
用 途：連鋳用浸漬ノズル
上記■、■、■はホットプレスや反応焼結製造法による
もので、焼結方法がコスト高である。また上記■、■は
有機物を結合剤として約ｔｏｏ。■Unexamined Japanese Patent Publication No. 48-90474 Composition: BN-A Mi 203-High silicate glass sintering method:
Hot press application: Semiconductor dope material (■ JP-A-48-43648 Composition: BN-A-5K Sintering method: Reaction sintering Application: High-temperature corrosion-resistant material ■ JP-A-57-84448-64450 Composition: B
N-(Al103, S=02, Mg
Sintering method: Hot press application: Mold for continuous casting of small diameter rods ■JP-A-55-34663 Composition: A1203-C aggregate, BN, Al203. Phenol resin sintering method Niruvar press normal pressure firing application: Immersion nozzle for molten steel■JP-A-56-139260~ Composition: BN, 5k02 graphite, Al203, organic binder sintering method Niruvar press atmospheric pressure firing application: Immersion nozzles for continuous casting The above methods (1), (2), and (2) are manufactured by hot pressing or reaction sintering, and the sintering method is expensive. Moreover, the above (■) and (■) are about too much when an organic substance is used as a binder.
℃で焼成して製造しており、ＢＮその他粒子間の焼結は
起こらず、単に有機バインダーで結合しているのみであ
る。It is manufactured by firing at a temperature of 0.degree. C., and BN and other particles are not sintered, but simply bound together by an organic binder.
本発明は上記従来の欠点を解消し、安価で性能の優れた
ＢＮ焼結体を提供することを目的とする０例えば、従来
市場にあるＢＮ保護管としてはホットプレス品が一般的
でありコストが高い。The present invention aims to eliminate the above-mentioned conventional drawbacks and provide a BN sintered body that is inexpensive and has excellent performance. is high.
本発明は安価な常圧焼結商品として例えばＢＮ保護管を
提供する。複合材にはＢＮと同様の高温材料であるＡ１
２０３を用（、％、両者の結合剤にＢ２０３を用いて、
複合化をはかるもので、本発明はＢ２Ｏ３によってＡ１
２０３とＢＮを焼結させた点において全く新規なもので
ある。The present invention provides, for example, a BN protection tube as an inexpensive pressureless sintered product. The composite material contains A1, a high temperature material similar to BN.
203 (%, using B203 as the binder for both,
This invention aims to combine A1 with B2O3.
This is a completely new product in that 203 and BN are sintered.
また、保護管を溶鋼の測温に使う場合、ＢＮが溶鋼に濡
れにくく耐食性に優れている特徴を生かＬＡｆＬｚＯ３
が熱スポーリング性に劣るのを補うことを目的としてい
る。In addition, when using a protection tube to measure the temperature of molten steel, LAfLzO3 takes advantage of the characteristics of BN, which is difficult to get wet with molten steel and has excellent corrosion resistance.
The purpose is to compensate for the poor thermal spalling properties of
本発明は、ＢＮを主成分とし、Ａ２０３を副成分、Ｂ２
０３を助剤として焼結体を構成する。The present invention uses BN as a main component, A203 as a subcomponent, and B2 as a subcomponent.
A sintered body is constructed using 03 as an auxiliary agent.
ＢＮ複合焼結体を作る場合、ＢＮと複合物の両者の特性
を生かす必要がある０本発明ではＢＮと同じく高温材料
であるＡｌ１０３を用いた。When making a BN composite sintered body, it is necessary to take advantage of the characteristics of both BN and the composite. In the present invention, Al103, which is a high temperature material like BN, was used.
ここに用いるＡ１２０３の粒度は、ＢＮと同等あるいは
細粒はど良（５ｇｍ以下、できればＩＩＬｍ以下が良い
０種類としては易焼結性アルミナが良い、アルミナ純度
は一般品で９９．９％以上（成分％は重量％を示す、以
下同じ）あり、ここで使用するものとして十分である０
価格は２００〜３００円／ｋｇであり、ＢＮが２０００
０〜２５０００円／ｋｇであるのに対し安い。The particle size of A1203 used here is equivalent to BN or fine (less than 5 gm, preferably less than IILm). Easily sinterable alumina is good as the type, and the alumina purity is 99.9% or more for general products. Ingredient % indicates weight % (the same applies hereinafter), and is sufficient for use here.
The price is 200-300 yen/kg, and the BN is 2000 yen/kg.
It is cheap compared to 0 to 25,000 yen/kg.
ＢＮ単体とＡ１２ ｏ３単体だけでは難焼結性であり一
般に助剤を添加して液相焼結が行われる。Since BN alone and A12 o3 alone are difficult to sinter, liquid phase sintering is generally performed by adding an auxiliary agent.
ＢＮとＡ１２０３の両方に共通する助剤としては、金属
酸化物の中で、ＴｉＯ２，ＭｇＯ１Ｃｒ２０３ 、Ｂ２
０３などがあるが、濡、れ性が良いのはＢ２Ｏ３である
。Auxiliaries common to both BN and A1203 include, among metal oxides, TiO2, MgO1Cr203, B2
03, etc., but B2O3 has good wettability.
ここでＡ１２０３の配合量を２０〜６０％に限定した理
由は、第１図に示すように２０％以下では曲げ強度が上
がらず、Ａ１２０３の効果を発揮できなく、また原料の
コストダウン寄与も少ない、一方、Ａｌ１２０３が６０
％以下になると耐スポーリング性が低下することおよび
焼結体の硬度が上がり旋盤による機械加工が困難になる
。The reason for limiting the blending amount of A1203 to 20 to 60% is that, as shown in Figure 1, if it is less than 20%, the bending strength will not increase, the effect of A1203 will not be exhibited, and the contribution to cost reduction of raw materials will be small. , while Al1203 is 60
% or less, the spalling resistance decreases and the hardness of the sintered body increases, making machining with a lathe difficult.
一方、第２図に示すようにＡ見２０３と助剤Ｂ２０３と
の重量割合には最適値が存在し、Ａ ３１２０３ ：
Ｂ２０３ ＝ １００ ： ５〜１０の範囲であり。On the other hand, as shown in FIG. 2, there is an optimal value for the weight ratio of A 203 and auxiliary agent B 203, and A 31203:
B203 = 100: in the range of 5 to 10.
９Ａ１２０３ ＠ ２Ｂ２０３ を生成する。9A1203 @2B203 generate.
Ｂ２Ｏ３が５以下では
９Ａ文２０３ ・２Ｂ２０３
を生成せず、焼結が十分に進まない、 Ｂ２０３が１０
部以上ではＢ２０３が多すぎて、焼結過程で、１５００
℃以上からフリーなり２０３が蒸発する。その結果、気
孔率の高い焼結体となる。If B2O3 is less than 5, 9A203 and 2B203 will not be generated and sintering will not progress sufficiently.
B203 is too large in the sintering process.
Free 203 evaporates from ℃ or higher. As a result, a sintered body with high porosity is obtained.
また、低温（１０３６℃）で液相を生成し、冷却中に焼
結体にクラックが発生したりあるいは変形したりする。In addition, a liquid phase is generated at a low temperature (1036° C.), and the sintered body cracks or deforms during cooling.
第１図、第２図の結果は４０φ×５〜１０ｍｍのタブレ
ットを成形し、非酸化性雰囲気下で１０”Ｑ ／ ｍ
１ ｎ昇温の後１ａｏｏ℃、１時間保持して製造した焼
結体の３点曲げ強度である。The results shown in Figures 1 and 2 are as follows: 40φ x 5~10mm tablets were molded, and 10"Q/m was formed in a non-oxidizing atmosphere.
This is the three-point bending strength of a sintered body produced by raising the temperature by 1n and then holding it at 1aoo°C for 1 hour.
ＢＮ粉末の性状は粒径５４ｍ以下、Ｌｃ３００オングス
トローム以下が良く１粒径、Ｌｃともに小さいほど良い
、粗粒になるとスプレードライヤーによる顆粒化が難し
く、う八−に充填する際に充填密度が高くならない。The properties of BN powder are preferably particle size of 54 m or less and Lc of 300 angstroms or less, and the smaller the particle size and Lc, the better.If the particles become coarse, it will be difficult to granulate them with a spray dryer, and the packing density will not be high when filling into a cavity. .
助剤Ｂ２Ｏ３はＢＮが高純度の場合は添加するが、ＢＮ
中に含まれていれば添加の必要はない。Auxiliary agent B2O3 is added when BN is of high purity, but
If it is included, there is no need to add it.
本発明のＢＮ管状体の製造工程を説明すれば、次の通り
である。The manufacturing process of the BN tubular body of the present invention will be explained as follows.
ＢＮ、Ａ立２０３ 、Ｂ２０３をアルコール中で所定時
間湿式混合し、乾燥する。スプレードライヤーを通すと
顆粒化し、充填性の良い粉末が得られる０次に保護管形
状のゴム型に充てんし、ラバープレスにて冷開成形し、
この成形体を非酸化性雰囲気中で通常１６００−１８０
０℃で焼成する。常圧の保護管はホットプレス品よりも
長尺に製造できるので、ホットプレス品よりも連結継ぎ
部が少いという利点がある。BN, A203, and B203 are wet mixed in alcohol for a predetermined period of time, and then dried. When passed through a spray dryer, it becomes granulated and a powder with good filling properties is obtained.The powder is then filled into a protective tube-shaped rubber mold, cold-opened and molded using a rubber press.
This molded body is usually heated to a temperature of 1600-180 in a non-oxidizing atmosphere.
Bake at 0°C. Normal-pressure protection tubes can be made longer than hot-pressed products, so they have the advantage of having fewer joints than hot-pressed products.
本発明は、ＢＮを主成分とし、Ａ２０３を副成分としＢ
２Ｏ３を助剤として構成した焼結体である。The present invention uses BN as a main component, A203 as a subcomponent, and B
This is a sintered body composed of 2O3 as an auxiliary agent.
ＢＮ複合焼結体を作る場合、ＢＮと複合物の両者の特性
を生かす必要がある０本発明ではＢＮと同じく高温材料
であるＡ ｌ ２σ３を用いた。When making a BN composite sintered body, it is necessary to take advantage of the characteristics of both BN and the composite. In the present invention, Al 2σ3, which is a high temperature material like BN, was used.
ＢＮとＡｆＬ２０３の特性を比較すると、結晶系、熱伝
導率、固有抵抗、誘電率は類似しているが、熱膨張率、
弾性率はＡｌ２０３の方が高い。Comparing the properties of BN and AfL203, the crystal system, thermal conductivity, specific resistance, and dielectric constant are similar, but the coefficient of thermal expansion,
Al203 has a higher elastic modulus.
ＡｌＩ３０３焼結体は機械的強度は強いが、溶融物の耐
スポーリング性に劣るという弱点がある。Although the AlI303 sintered body has strong mechanical strength, it has a weak point of poor spalling resistance of the molten material.
この両者を複合することによって焼結体の機械的強度を
向上すること、熱膨張率を小さくすることおよび耐食性
の向上を図ることができる。By combining the two, it is possible to improve the mechanical strength of the sintered body, reduce the coefficient of thermal expansion, and improve corrosion resistance.
Ａｌ２Ｏ３は本来、高強度材料であるが、ＢＮとの複合
化を狙う場合、ＢＮとＡｌ２Ｏ３は反応しないので、Ａ
ｆＬ２０３の特性を十分に発揮できない。そこで、本発
明は両者を焼結させる助剤としてＢ２Ｏ３を用いその作
用により、これを達成したものである。Al2O3 is originally a high-strength material, but when aiming to form a composite with BN, since BN and Al2O3 do not react, A
The characteristics of fL203 cannot be fully demonstrated. Therefore, the present invention achieves this by using B2O3 as an auxiliary agent for sintering both.
外径２０ｍｍφ、内径１０ｍｍφ、長さ４９０ｍｍの本
発明の保護管を、
Ｂ Ｎ （Ｌ ｃ ２０５オングストローム、純度９８
％）：１２０ｇ、
ＡｌＩ３０３ ： ７４ｇ、
Ｂ２０３ ： ３．６ ｇ。A protective tube of the present invention having an outer diameter of 20 mmφ, an inner diameter of 10 mmφ, and a length of 490 mm is made of B N (L c 205 angstroms, purity 98
%): 120g, AlI303: 74g, B203: 3.6g.
ＢＮ／ （ＢＮ＋Ａ文２０３ ＋８２０３ ）＝０．６
゜
Ｂ２ ０３ ／Ａ見見２０３＝７１００を原料とし、
次の工程によって２本製造した。BN/(BN+A sentence 203 +8203)=0.6
゜B2 03 / A 203 = 7100 as raw material,
Two pieces were manufactured using the following steps.
ｌ） 混合
ボールミル アルコール６００ ｃ ／ ｃ２） 乾燥
、造粒
スプレードライヤー
３） 充填
ゴム型寸法、内径３０φ、鉄芯ｌＯφ。l) Mixing ball mill Alcohol 600 c/c2) Drying, granulation spray dryer 3) Filled rubber mold dimensions, inner diameter 30φ, iron core lOφ.
長さ５００ｍｍ ４） ラバープレス成形 成形加重１．５７ｏｎ／ｃｒｎ’、 １．５ｍ１ｎ。length 500mm 4) Rubber press molding Molding load 1.57 on/crn', 1.5m1n.
５） 焼成 １８００℃ＸＩＨｒ、 高周波（カーボンルツボ）Ｎ２雰囲気炉埋め粉：ＢＮ 上記製品につき次の評価試験を行った。5) Firing 1800℃XIHr, High frequency (carbon crucible) N2 atmosphere furnace filling powder: BN The following evaluation test was conducted on the above product.
１）ＢＮ高純化炉の炉内測温用保護管
ＢＮ高純化炉は高純化過程でＢ２Ｏ３ガスが発生するの
で、従来のＡｆＬ２０３保護管では耐久性が小さく、１
日の炉操業（４Ｈｒ）で破損してしまう、一方、本発明
の保護管により２０回使用可能になった。1) Protection tube for in-furnace temperature measurement in a BN high-purification furnace Since B2O3 gas is generated during the high-purification process in a BN high-purification furnace, the durability of the conventional AfL203 protection tube is low.
However, with the protective tube of the present invention, it can be used 20 times.
２） スラグ温度の測定
レンガ浸食試験において、スラグの温度測定用保護管に
使用した。従来、消耗型温度計を使い、間けつ的な測温
しかできなかったが、連続側温か可能になった。2) Measurement of slag temperature In the brick erosion test, it was used as a protective tube for measuring the temperature of slag. Previously, consumable thermometers could only be used to measure temperatures intermittently, but now it is now possible to measure temperatures continuously.
従来、ホットプレス製ＢＮ製品は高価格のために普及し
なかった。In the past, hot-pressed BN products were not popular due to their high price.
ＢＮは熱衝撃性が強いので、高温炉、特殊な雰囲気炉、
溶融物の測温などに充分使用可能であり、本発明のＢＮ
焼結体は耐久性がホットプレス製に準するものであって
、極めて低廉である。BN has strong thermal shock properties, so it cannot be used in high-temperature furnaces, special atmosphere furnaces,
The BN of the present invention can be fully used for temperature measurement of molten materials, etc.
The durability of the sintered body is comparable to that made by hot pressing, and it is extremely inexpensive.
従って他方面において便利に使用できる。Therefore, it can be conveniently used on the other side.
第１図は５０φ×１０〜２０ｍｍのタブレット焼結体の
曲げ強度とＢＮ重量配合比の関係をＢ２Ｏ３／Ａ文２０
３重量比をパラメーターとして示したグラフ、第２図は
曲げ強度とＢ２０３ ／ＡｆＬ２０３重量比の関係をＢ
Ｎ重量配合比をパラメーターとして示したグラフである
。Figure 1 shows the relationship between the bending strength of a 50φ x 10~20mm tablet sintered body and the BN weight blending ratio.
Figure 2 shows the relationship between bending strength and B203/AfL203 weight ratio.
It is a graph showing the N weight blending ratio as a parameter.
Claims (1)
量比）の組成の混合物２０〜６０重量部とからなる窒化
硼素系常圧焼結体。 ２ 焼結体がラバープレス成形体である特許請求の範囲
第１項に記載の常圧焼結体。[Scope of Claims] 1 A boron nitride-based atmospheric pressure sintered body comprising 40 to 80 parts by weight of BN and 20 to 60 parts by weight of a mixture having a composition of Al_2O_3:B_2O_3=100:10-5 (weight ratio). 2. The pressureless sintered body according to claim 1, wherein the sintered body is a rubber press molded body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59251337A JPS61132564A (en) | 1984-11-28 | 1984-11-28 | Boron nitride normal pressure sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59251337A JPS61132564A (en) | 1984-11-28 | 1984-11-28 | Boron nitride normal pressure sintered body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61132564A true JPS61132564A (en) | 1986-06-20 |
Family
ID=17221321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59251337A Pending JPS61132564A (en) | 1984-11-28 | 1984-11-28 | Boron nitride normal pressure sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61132564A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0244067A (en) * | 1988-08-04 | 1990-02-14 | Koransha Co Ltd | Bn no-pressure sintered ceramic having excellent melting flacture resistance |
| EP0694500A1 (en) | 1994-06-30 | 1996-01-31 | Nkk Corporation | Boron nitride-containing material and method thereof |
| JP2005315845A (en) * | 2004-03-30 | 2005-11-10 | Citizen Watch Co Ltd | Detection element for gas sensor and contact combustion type gas sensor |
| US7914886B2 (en) | 2003-08-21 | 2011-03-29 | Saint-Gobain Ceramics & Plastics, Inc. | Structural component comprising boron nitride agglomerated powder |
| JP2011233939A (en) * | 2004-06-24 | 2011-11-17 | Toyoda Gosei Co Ltd | Method of manufacturing light-emitting device |
| JP2012162417A (en) * | 2011-02-04 | 2012-08-30 | Nagoya City | Free-cutting ceramic, and method for producing the same |
| EP3279173A1 (en) | 2016-08-05 | 2018-02-07 | 3M Innovative Properties Company | Formed hexagonal boron nitride body, heat-treated hexagonal boron nitride body and processes for producing the same |
| USRE47635E1 (en) | 2001-08-07 | 2019-10-08 | Saint-Gobain Ceramics & Plastics, Inc. | High solids hBN slurry, hBN paste, spherical hBN powder, and methods of making and using them |
-
1984
- 1984-11-28 JP JP59251337A patent/JPS61132564A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0244067A (en) * | 1988-08-04 | 1990-02-14 | Koransha Co Ltd | Bn no-pressure sintered ceramic having excellent melting flacture resistance |
| EP0694500A1 (en) | 1994-06-30 | 1996-01-31 | Nkk Corporation | Boron nitride-containing material and method thereof |
| US5633214A (en) * | 1994-06-30 | 1997-05-27 | Nkk Corporation | Boron nitride-containing material and method thereof |
| US5908795A (en) * | 1994-06-30 | 1999-06-01 | Nkk Corporation | Boron nitride containing material |
| USRE47635E1 (en) | 2001-08-07 | 2019-10-08 | Saint-Gobain Ceramics & Plastics, Inc. | High solids hBN slurry, hBN paste, spherical hBN powder, and methods of making and using them |
| US8169767B2 (en) | 2003-08-21 | 2012-05-01 | Saint-Gobain Ceramics & Plastics, Inc. | Boron nitride agglomerated powder and devices comprising the powder |
| US7914886B2 (en) | 2003-08-21 | 2011-03-29 | Saint-Gobain Ceramics & Plastics, Inc. | Structural component comprising boron nitride agglomerated powder |
| US8425846B2 (en) | 2004-03-30 | 2013-04-23 | Citizen Holdings Co., Ltd. | Sensing element for catalytic combustion type gas sensor |
| JP2005315845A (en) * | 2004-03-30 | 2005-11-10 | Citizen Watch Co Ltd | Detection element for gas sensor and contact combustion type gas sensor |
| JP2011233939A (en) * | 2004-06-24 | 2011-11-17 | Toyoda Gosei Co Ltd | Method of manufacturing light-emitting device |
| JP2012162417A (en) * | 2011-02-04 | 2012-08-30 | Nagoya City | Free-cutting ceramic, and method for producing the same |
| EP3279173A1 (en) | 2016-08-05 | 2018-02-07 | 3M Innovative Properties Company | Formed hexagonal boron nitride body, heat-treated hexagonal boron nitride body and processes for producing the same |
| WO2018026548A1 (en) | 2016-08-05 | 2018-02-08 | 3M Innovative Properties Company | Formed hexagonal boron nitride body, heat-treated hexagonal boron nitride body and processes for producing the same |
| US10954164B2 (en) | 2016-08-05 | 2021-03-23 | 3M Innovative Properties Company | Formed hexagonal boron nitride body, heat-treated hexagonal boron nitride body and processes for producing the same |
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