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1. 发明授权

EP0146013B1 Coating composition for preventing high temperature oxidation for electrodes 失效
标题翻译：用于防止电极高温氧化的涂料组合物
公开(公告)号：EP0146013B1
公开(公告)日：1989-10-11
申请号：EP84114225.0
申请日：1984-11-24
申请人： Mitsumaru Chemical & Synthetic Industrial Co., Ltd.
发明人： Funahashi, Kazutomi , Yoshii, Koichi , Nakamura, Yoichi , Oshikiri, Tatsumi , Kobayashi, Hajime
IPC分类号： H05B7/12 , H05B7/085
CPC分类号： H05B7/085 , H05B7/12

2. 发明公开

EP0146013A2 Coating composition for preventing high temperature oxidation for electrodes 失效
标题翻译：涂层的组合物以避免氧化在高温下的电极的。
公开(公告)号：EP0146013A2
公开(公告)日：1985-06-26
申请号：EP84114225.0
申请日：1984-11-24
申请人： Mitsumaru Chemical & Synthetic Industrial Co., Ltd.
发明人： Funahashi, Kazutomi , Yoshii, Koichi , Nakamura, Yoichi , Oshikiri, Tatsumi , Kobayashi, Hajime
IPC分类号： H05B7/12 , H05B7/085
CPC分类号： H05B7/085 , H05B7/12
摘要： The invention relates to a coating composition containing ceramic components, for preventing high temperature oxidation, which is to be applied especially for graphite electrodes employed in electric furnace steelmaking. This ceramic composition consists of the following components:

(a) 40-75% by weight of silicon carbide as heat radiation component,
(b) 15-40% by weight of a binding and heat radiation promoting component consisting of 3-20 parts by weight of silicon nitride, 5-20 parts by weight of salt of phosphorus-containing acid, 2-10 parts by weight of chromium oxide, 2-10 parts by weight of tantalum carbide and 5-20 parts by weight of pulverous aluminium,
(c) 10-35% by weight of an additive for improving the adhesion to the graphite electrode and increasing the binding strength between the coated layers, consisting of
1-10 parts by weight of aluminium oxide, 3-15 parts by weight of glass powder, 3-15 parts by weight of zirconium oxide, 1-10 parts by weight of silicon dioxide, 1-10 parts by weight of magnesium oxide and 1-10 parts by weight of iron oxide.
(d) 5-20% by weight of metal powder consisting of 0-40 parts by weight of pulverous copper, 0-40 parts by weight of pulverous nickel, 0-40 parts by weight of pulverous stainless steel, 0-40 parts by weight of pulverous iron and 0-40 parts by weight of pulverous tin,
(e) 2-5% by weight of a sintering promotor mixture consisting of
10-30 parts by weight of silver carbonate and 30-50 parts by weight of copper sulfate and/or 30-50 parts by weight of iron sulfate, and
(f) 3-7% by weight of a melting point lowering component consisting of
30-60 parts by weight of iron fluoride and 40-70 parts by weight of copper fluoride, wherein the total of the above components (a)-(f) sums up to 100% by weight. This composition provides steelmaking graphite electrode with a burnt coated layer exhibiting a quite excellent adhesion and superior gas-tightness.

3. 发明公开

EP0146013A3 Coating composition for preventing high temperature oxidation for electrodes 失效
标题翻译：用于防止电极高温氧化的涂料组合物
公开(公告)号：EP0146013A3
公开(公告)日：1985-08-07
申请号：EP84114225
申请日：1984-11-24
申请人： Mitsumaru Chemical & Synthetic Industrial Co., Ltd.
发明人： Funahashi, Kazutomi , Yoshii, Koichi , Nakamura, Yoichi , Oshikiri, Tatsumi , Kobayashi, Hajime
IPC分类号： H05B07/12 , H05B07/085
CPC分类号： H05B7/085 , H05B7/12
摘要： The invention relates to a coating composition containing ceramic components, for preventing high temperature oxidation, which is to be applied especially for graphite electrodes employed in electric furnace steelmaking. This ceramic composition consists of the following components:
(a) 40-75% by weight of silicon carbide as heat radiation component, (b) 15-40% by weight of a binding and heat radiation promoting component consisting of 3-20 parts by weight of silicon nitride, 5-20 parts by weight of salt of phosphorus-containing acid, 2-10 parts by weight of chromium oxide, 2-10 parts by weight of tantalum carbide and 5-20 parts by weight of pulverous aluminium, (c) 10-35% by weight of an additive for improving the adhesion to the graphite electrode and increasing the binding strength between the coated layers, consisting of
1-10 parts by weight of aluminium oxide, 3-15 parts by weight of glass powder, 3-15 parts by weight of zirconium oxide, 1-10 parts by weight of silicon dioxide, 1-10 parts by weight of magnesium oxide and 1-10 parts by weight of iron oxide. (d) 5-20% by weight of metal powder consisting of 0-40 parts by weight of pulverous copper, 0-40 parts by weight of pulverous nickel, 0-40 parts by weight of pulverous stainless steel, 0-40 parts by weight of pulverous iron and 0-40 parts by weight of pulverous tin, (e) 2-5% by weight of a sintering promotor mixture consisting of
10-30 parts by weight of silver carbonate and 30-50 parts by weight of copper sulfate and/or 30-50 parts by weight of iron sulfate, and (f) 3-7% by weight of a melting point lowering component consisting of
30-60 parts by weight of iron fluoride and 40-70 parts by weight of copper fluoride, wherein the total of the above components (a)-(f) sums up to 100% by weight. This composition provides steelmaking graphite electrode with a burnt coated layer exhibiting a quite excellent adhesion and superior gas-tightness.

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