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研究生:裴文俊
研究生(外文):Wen-Chiun Pei
論文名稱:鋼料在硼砂浴中碳化物層的被覆研究
論文名稱(外文):A Study on the Carbide Coating of Steels in Borax Baths
指導教授:陳永傳
指導教授(外文):Yong Chuang Chen
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:1993
畢業學年度:81
語文別:中文
論文頁數:130
中文關鍵詞:碳化釩碳化鉻硼砂浴耐磨耗性 
外文關鍵詞:Vanadium carbideChromium carbideBorax bathWear resistance
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為了在鋼料表面被覆硬度極高的碳化物被覆層(碳化釩及碳化鉻),將市
售的硼砂乾燥後,添加適量的V-Fe合金粉末或Cr金屬粉末,而將此種含
有 V-Fe或Cr粉的硼砂在氮氣保護氣體中加熱到熔融狀態,並在此種硼砂
浴中加熱各種含碳量的鋼料。由加熱後鋼料表面所形成的碳化物層之厚度
、硬度、黏著性、耐磨耗性、顯微組織及晶格結構等,研究處理條件對鋼
料表面之碳化物被覆層的影響。所得結果如下: 1.鋼料在添加V-Fe或Cr
粉的硼砂浴中加熱時,表面會生成硬度極高的碳化 釩(約Hv2800)或碳
化鉻(約Hv1800)碳化物被覆層。 2.硼砂浴在氮氣保護氣體下操作,能
有效減緩硼砂浴的劣化速率,延長使 用壽命。 3.提高V-Fe粉重量百分
比或提高硼砂浴溫度均能有效增加碳化物被覆速率 ,但所生成碳化物硬
度會下降,空孔率會上升。 4.鋼料含碳量愈高,則碳化物層被覆速率愈
快,而且硼砂浴的使用壽命愈 長。 5.鋼料浸漬硼砂浴前經滲碳處理者
,能有效提高碳化物層被覆速率,縮短 處理時間。 6.鋼料實施滲碳前
處理時,宜用高碳勢之滲碳條件,較能有效地提高碳化 物層的被覆速率
。 7.鋼料被覆VC後,其抵抗磨耗的能力約為原材料的10倍,一般淬火硬
化者 的6倍。
To form a thin layer of vanadium or chromium carbide with an
ultra-hardness on the surface of steels, steels with various
carbon contents were heated in the borax bath containing the
powder of ferro-vanadium or chromium. The influence of process
conditions on the layer of carbide was studied through
examining the thickness, hardness, adhesion, wear-resistance,
microscopy and X-ray diffraction of the layer. The results
obtained were summarized as follows: 1. A thin layer of
vanadium carbide or chromium carbide with an ultra-hardness was
formed on the surface of the steels which were heated in a
borax bath containing the powder of ferro- vanadium or
chromium. 2. When the borax was melt under the nitrogen
atmosphere, the duration of the borax bath was increased. 3.
Increasing the weight ratio of V-Fe powder to the borax bath or
the temperature of the borox bath led to an increase in the
coating rate of the carbide layer, but the hardness of the
layer was decreased and the vacancy ratio was increased. 4. The
higher the carbon content of steels, the more rapid the growth
rate of the carbide layer and the longer the duration ofthe
borax bath. 5. The growth rate of the carbide layer increased
substantially if the steel was carburized before being heated
in the borax bath. 6. When the steel was carburized before
being heated in the borax bath, the higher the carbon potential
of carburizing system; the more rapid the growth rate of the
carbide layer. 7. The wear resistance of the steel coated a
layer of vanadium carbide was superior to those of both the
original steel and quenched steel by 10 and 6 times,
respectively.
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