http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오이식,황룡길 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.11
To determine the mechanism by which zinc ferrite forms when ferrous zinc sulphide ore is roasted, the experiment has been carried out under given conditions by sufficiently mixing zinc oxide with ferric oxide in a stoichiometric way. The results obtained from this experiment are summarized as follows: 1) Formation of zinc ferrite was confirmed by x-ray diffraction analysis in formed compound at alternation of various mole ratio and temperatures. 2) Zinc ferrite was obtained by stoichiometric ratio without any effect of mixed mole ratio i.e., zinc ferrite was not confirmed at temperature less than 700℃, but was found at above 700℃. 3) Zinc leaching rate of synthetic zinc ferrite on sulphuric acid solution or ammonium salt solution was similar at low temperatures (below 680℃), but decreased at above 700℃. For ammonium salt solution (ZnO: Fe₂O₃=1 : 1), the zinc leaching rate was found to be 9.07% at 1000℃ and 49.97% at 700℃, respectively. This zinc leaching rate for sulphuric solid solution (ZnO: Fe₂O₃=1 : 1), however, showed 25.03% at 1000℃ and 95.79% at a temperature 700℃. Therefore, zinc leaching rate of zinc ferrite on sulphuric acid solution was found to be more than twice as much as for ammonium salt solution. 4) Zinc ferrite was found to from at 1000℃ even under conditions of changing mole ratio. For ZnO: Fe₂O₃= 1:1, however, the formation of zinc ferrite only was confirmed. When values of the ratio of ZnO to Fe₂O₃were 1 to 1 and 5 to 1, both zinc ferrite and free zinc oxide were obtained, where when its value was 1 to 2 the formation of zinc ferrite and free Fe₂O₃was determined.
高Cr-Ni鋼의 熱處理에 의한 機械的性質의 變化에 대한 硏究
吳伊植 釜山工業大學校 1979 論文集 Vol.20 No.-
高Cr-Ni合金鋼의 再加熱에 의한 機械的性質의 變化가 있었다. 그 結果를 要約하면 다음과 같다. (1) 1000℃ 燒鈍 水冷후 475∼525℃에서의 時效 경우, α基地에서 Cr相의 析出로 引張强度와 0.2% 항복강도 增加하고 延伸率은 減少하였다. 斷面收縮率은 60∼70% 程度로 一定하였다. (2) 650∼800℃로 再加熱하면 α-γ 變態가 생기고 0.2% 항복강도는 γ가 增加함에 따라 減少한다. 引張强度는 變態가 항복강도와 같이 一定하게 變하지 않는 동안 γ相의 加工硬化로 인하여 增加한다. (3) Charpy衝擊값은 475∼525℃ 時效에서 減少된다. 이것은 475∼525℃ 脆性에 의한 遷移溫度의 上昇 때문이다. The effect of heat treatment on the mechanical properties of Fe-Cr-Ni alloy has been investigated to heating, and the results are summarized as follows. (1) After 1000℃ amealed and water cooling, in case of aging at 475∼525℃, the tensile strength and 0.2% yield strength increase continuously with aging time owing to the precipitation of Cr phase in ferrite matrix in spite of the decrease in elongation. The reduction of area shows an approximately constant value of 60∼70%. (2) Heating at 650∼800℃ produces the α-γtransformation and 0.2% yield strength decreases with the increase of γcontent. The tensile strength that is affected by work hardening of γphase during the deformation does not vary in paralled with the yiled strength. (3) Charpy impict value decreases with aging time at 475∼525℃. The testing temperature dependence of the charpy impact values is based on the raise in the transition temperature due to the 475℃ embrittlement.
오이식,배영한,Oh Iee-Sik,Bai Young-Han 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.1
무전해 Ni-Cu-B 폐 도금액의 재사용에 대해 소정의 조건에서 조사하였다. 아연화처리한 후 니켈 촉매의 처리는 니켈 촉매처리를 하지 않았을 때 보다 도금시간이 연장되었다. Batch type에서 새로 제조한 도금액에 폐 도금액을 40% 첨가하여도 무전해 Ni-Cu-B 폐 도금액의 재사용이 가능하였다. 새로 제조한 도금액에 소모된 도금액의 성분을 연속적으로 보충하여 도금하면(continuous type), 보충하지 않았을 경우(batch type) 보다 도금시간이 6배 연장되었다. 새로 제조한 도금액에 폐 도금액 40%를 첨가하여 소모된 도금 액의 성분을 연속적으로 보충할 경우(continuous type)의 도금시간은 보충하지 않았을 경우(continuous type)의 도금시간 보다 2배 연장되었다. 도금층의 불량과 급격한 도금속도의 감소는 도금층의 Ni과 Cu의 성분 변화에 큰 영향을 미쳤다. Reusing of electroless Ni-Cu-B waste solution was investigated in the plating time, plating rate, solution composition and deposit. Plating time of nickel-catalytic surface took longer than that of zincated-catalytic surface. Initial solution with 40% waste solution additive at batch type was possible to reusing of waste solution. Plating time of initial solution at continuous type took longer 6 times over than that of batch type. Plating time of 40% waste solution additive at continuous type took longer 2 times over than that of batch type. Component change of nickel-copper for electroless deposition was greatly affected by deposited inferiority and larger decreased plating rate.
무전해 Ni-Cu-P 합급도금에 미치는 도금욕 조성과 도금조건에 관한 고찰
오이식 釜山工業大學校 1990 論文集 Vol.32 No.-
In the eletroless nickel-copper-phosphorus alloy plating bath which contained nickel sulfate, copper sulfate, sodium hypophosphite, sodium citrate, ethylenediamine, inhibitor(thiourea) and accelerator(NaF), effect of their concentration on the rate of deposition was tested by gravimetric method. The results obtained from this experiment are summarized as follow ; The optimum composition of the electroless nickel-copper-phosphorus bath was estimated 0.1 mole of mickel sulfate, 0.01 mole of copper sulfate, 0.2 mole of sodium hypophosphite, 0.18 mole of sodium citrate and 0.4 mole of etylenediamine at pH 9~10, 80~85℃. The activation energies for 75~85℃ have been calculated to be 66.7KJ/mole. The deposition rate from the bath which contained neither NaF(accelerator) nor thiourea(inhibitor) was about 44.799 mg/10㎠·30min at pH 9.0, 80℃, whereas plating rate increased further (34%) to 60.030 mg/10㎠· 30min with addition of 200 ppm of NaF and 0.8 ppm of thiourea to the bath.