JP6869229B2 - 耐火物用骨材、その製造方法、及びそれを用いた耐火物 - Google Patents
耐火物用骨材、その製造方法、及びそれを用いた耐火物 Download PDFInfo
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Description
[実施例1〜5、比較例1〜3]
炭酸カルシウム:船尾鉱山製 船尾石灰石
水酸化カルシウム:位登産業製
水酸化アルミニウム:住友化学製 C301N
コーンスターチ:日本コーンスターチ製 Y−3P
ホウ砂:和光純薬工業製 Dehybor
JIS R 2205:1992「耐火れんがの見掛気孔率・吸水率・比重の測定方法」に定められる煮沸法による吸水率の測定方法にて測定した。骨材の吸水率は、それを用いて製造される耐火物の熱伝導率と負の相関関係にあるため、充分低い熱伝導率の耐火物が得られる吸水率が50%以上を○(合格)、50%未満を×(不合格)とした。
内容積15.8cm3のガラス瓶に得られたCA6粒子の骨材をガラス瓶の口から溢れるまで盛った後、数回タッピング(高さ1cmより落下)後、ガラス瓶の口から溢れている骨材をすり切り、ガラス瓶の重さ増分を内容積で割った値を嵩密度とした。
3〜6mmのCA6粒子の骨材1粒を水平な定盤の上に置き、定盤と平行な面を持つ荷重計測器でCA6粒子の骨材を押し込み、骨材が破壊されるまでの最大荷重を骨材耐荷重とした。ここで、骨材耐荷重の合否判定基準として、10N以上を○(合格)、10N未満を×(不合格)とした。
実施例1〜5及び比較例1〜3で得られたCA6粒子の骨材を、粒径3mm以上6mm未満(粗粒)、1mm以上3mm未満(中粒)、粒径1mm未満(微粒)に篩分けしたもの、平均粒径2μmのアルミナ微粉、アルミナセメントを、表2に示す配合に計量後、所定量の水を添加し、万能ミキサーを用いて混合した後、40mm×40mm×160mmの型枠に流し込み、温度20℃で硬化、脱枠後、110℃で24時間乾燥させ、CA6粒子を骨材とする耐火物を得た。
アルミナ微粉:昭和電工製 AL−170
アルミナセメント:デンカ製 ハイアルミナセメントスーパー
JIS R 2553:1992「キャスタブル耐火物の強さ試験方法」に記載される方法にて測定。ここで、曲げ強度の合否判定基準として、1.5MPa以上を○(合格)、1.5MPa未満を×(不合格)とした。
Claims (5)
- 結晶相がCaO・6Al2O3であって、粒径3mm以上6mm未満に篩分けしたときの、JIS R 2205:1992に定められる煮沸法による吸水率が50%以上100%以下であり、かつ嵩密度が0.40g/cm3以上0.60g/cm3以下であることを特徴とする耐火物用骨材。
- 0.02質量%以上0.4質量%以下のホウ素が含有されてなる請求項1記載の耐火物用骨材。
- 請求項1または2記載の耐火物用骨材を骨材とし、アルミナセメントを結合材とした耐火物。
- カルシア原料及びアルミナ原料を含む骨材原料を水と混合、成形後、1000℃〜1700℃で焼成して得られる請求項2記載の耐火物用骨材の製造方法であって、前記骨材原料にホウ砂を添加すること特徴とする請求項2記載の耐火物用骨材の製造方法。
- 前記骨材原料に加えるホウ砂の添加量が0.1質量%以上4.0質量%以下である請求項4記載の耐火物用骨材の製造方法。
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