JP7225376B2 - 耐火物 - Google Patents
耐火物 Download PDFInfo
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Description
本明細書で開示する耐火物は、焼成炉の内壁等の焼成炉を構成する部品、あるいは、ラック,セッター等の焼成炉内で使用される部品として用いられる。特に限定されないが、本明細書で開示する耐火物は、最高温度が500~1350℃となる環境で好適に使用することができる。耐火物の形状は、平板状、箱状、柱状、ブロック状、筒状等であってよい。耐火物の厚みは、0.1~20mmであってよい。耐火物は、Si-SiC質基材と、Si-SiC質基材の表面を被覆するガラス層を備えていてよい。なお、従来のSi-SiC質基材で作製された耐火物は、Si-SiC質焼成体を成形した後に、表面に残存したSi(あるいは、Si化合物)を除去する工程を有する。そのため、従来の耐火物は、Si-SiC質耐火物の作製過程で表面にガラス層が形成されたとしても、表面のSiを除去する工程にてガラス層も除去される。すなわち、従来のSi-SiC質基材で作製された耐火物は、表面にガラス層が設けられていない。
Si-SiC質基材は、SiC粒子を主体とし、SiC粒子間に金属Siが含まれていてよい。なお、「SiC粒子を主体とする」とは、Si-SiC質基材に占めるSiC粒子の割合(質量%)が50質量%より大きいことを意味する。特に限定されないが、Si-SiC質基材に占めるSiC粒子の割合は、55質量%以上であってよく、60質量%以上であってよく、70質量%以上であってよく、80質量%以上であってよい。SiC粒子のサイズ(平均粒子径)は、5μm以上100μm以下であってよい。SiC粒子のサイズが小さすぎるとSiC粒子間に金属Siが導入されにくくなり、SiC粒子のサイズが大きすぎるとSi-SiC質基材の強度が低下する。SiC粒子のサイズ(平均粒子径)は、10μm以上であってよく、20μm以上であってよく、30μm以上であってよい。また、SiC粒子のサイズは、80μm以下であってよく、70μm以下であってよく、60μm以下であってよい。
ガラス層は、Si-SiC質基材の表面全体を被覆していてよい。特に限定されないが、ガラス層の厚みは、0.1μm以上150μm以下であってよい。ガラス層の厚みを0.1μm以上にすることにより、クラックの発生を抑制する効果が十分に得られる。また、ガラス層の厚みを150μm以下にすることにより、Si-SiC質基材とガラス層の熱膨張係数の相違に基づいてガラス層からSi-SiC質基材に力(応力)が加わってクラックが発生するという現象を抑制することができる。ガラス層の厚さ(平均厚さ)は、Si-SiC質基材表面の凹凸の表面粗さRzより薄いことが好ましく、例えば、100μm以下であってよく、60μm以下であってよく、40μm以下であってよい。また、ガラス層の厚さは、0.5μm以上であってよく、1μm以上であってよく、5μm以上であってよく、10μm以上であってよい。
図1を参照し、耐火物の製造工程について説明する。なお、Si-SiC質基材の焼成体については、製造方法も含め公知である。そのため、以下の説明では、主にSi-SiC質基材の表面にガラス層を形成する工程について説明する。
ローラー状の耐火物を複数作製し、耐火物の強度評価を行った。まず、上記したステップS1及びS2の工程を経て、外径42mm、内径30mm、長さ1000mmのローラー形状のSi-SiC質焼成体を得た。得られたSi-SiC質焼成体の見掛け気孔率は、2%以下であった。次に、大気雰囲気の焼成炉内にSi-SiC質焼成体を配置し、昇温速度100℃/hで所定温度まで昇温し、所定温度で所定時間保持することにより、基材(Si-SiC質焼成体)に含まれるSiを酸化させ、基材表面にガラス層を堆積させ、室温まで自然降温させ、耐火物を作製した(試料1~12)。
式(1):W=((W1-W0)/W0)×100
試料1~12について曲げ強度を測定した。曲げ強度は、得られた試料をスパン600mmのスパン台上に載せ、常温で3点曲げ試験を実施し、測定した。図3に、各試料の曲げ強度結果を示す。図3に示すように、Si-SiC質基材に対するガラス層の質量比率が0.001質量%以上5質量%以下の試料(試料2~11)は、130MPa以上の高い強度が得らえることが確認された。特に、質量比率が0.003質量%以上3質量%以下の試料(試料2,4~11)は、一層高い強度(150MPa以上)が得られることが確認された。
Claims (8)
- SiC粒子を主体とし、SiC粒子間に金属Siが含まれるSi-SiC質基材と、
前記Si-SiC質基材の表面を被覆するSiO2を主体とするガラス層と、を備え、
前記Si-SiC質基材に対するガラス層の質量比率が、0.007質量%以上1.1質量%未満である耐火物。 - SiC粒子を主体とし、SiC粒子間に金属Siが含まれるSi-SiC質基材と、
前記Si-SiC質基材の表面を被覆するSiO 2 を主体とするガラス層と、を備え、
前記Si-SiC質基材に対するガラス層の質量比率が、0.007質量%以上1.1質量%未満であり、
前記Si-SiC質基材の見掛け気孔率が0%超5%以下である耐火物。 - 前記Si-SiC質基材に対するガラス層の質量比率が、0.02質量%以上1.1質量%未満である請求項1または2に記載の耐火物。
- ガラス層の厚みが、前記Si-SiC質基材の表面の凹凸の深さより薄い請求項1から3のいずれか一項に記載の耐火物。
- 前記Si-SiC質基材の表面の凹凸の表面粗さRzが、0.1μm以上150μm以下である請求項1から4のいずれか一項に記載の耐火物。
- ガラス層が、Al,Ca,Fe,Na,K,Mg,Sr及びBaから選択される少なくとも1種の元素を含む請求項1から5のいずれか一項に記載の耐火物。
- ガラス層が、Al,Ca,Fe,Na及びKから選択される少なくとも1種の元素を含む請求項6に記載の耐火物。
- ガラス層上に表面コート層が設けられている請求項1から7のいずれか一項に記載の耐火物。
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JP2019182486 | 2019-10-02 | ||
JP2019182486 | 2019-10-02 | ||
PCT/JP2020/033680 WO2021065355A1 (ja) | 2019-10-02 | 2020-09-04 | 耐火物 |
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JP2009234817A (ja) | 2008-03-26 | 2009-10-15 | Covalent Materials Corp | 電子部品焼成用道具材 |
JP2012056813A (ja) | 2010-09-10 | 2012-03-22 | Nippon Crucible Co Ltd | 耐火材の成形焼成物 |
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JPH06144966A (ja) * | 1992-11-02 | 1994-05-24 | Ngk Insulators Ltd | Si−SiC質耐火物 |
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JP6225093B2 (ja) * | 2014-10-27 | 2017-11-01 | 日本碍子株式会社 | 複合耐火物 |
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