ZHANG Qiyun
,
LIU Shuqi
,
XU Yaping Peking University
,
Beijing
,
China professor
,
Department of Chemistry
,
Peking University
,
Beijing
,
100871
,
China
金属学报(英文版)
The features of Cu_6Sn_5 growing slowly at lower temperature and growing rapidly up over 350℃,and or Cu_3Sn growing at higher temperatures,bave been detailedly observed under SEM.The increase of Pb content seems to inhibit sequentially the growth of Cu_6Sn_5 in Pb-Sn alloy.
关键词:
Cu
,
null
,
null
,
null
,
null
ZHANG Qiyun
,
LIU Shuqi
,
ZHANG Yuhua
,
Peking University
,
Beijing
,
China
金属学报(英文版)
The interaction of oxide film with molten flux during aluminum brazing has been studied by means of X-ray powder diffraction. The following conclusions have been deduced: The swell- ing of aluminum oxide film is caused by Li~+ inserting into the vacancies of octahedral or tetrahedral structure of 0 atom skeleton in у-Al_2O_3 . The strength of oxide film decreases as the crytallinity increases by the treating of flux containing LiF.
关键词:
molten salt flux
,
null
,
null
LIU Shuqi
,
YI Tao
,
Peking University
,
Beijing
,
China
金属学报(英文版)
The diagram of Ag-Cu-Ge system was constructed from the investigation of 13 internal sec- tions by DTA heating as well as cooling curves in an atomsphere of dry N_2 . The phase dia- gram is subdivided into two pseudo-ternary systems shown as Ag-Cu-Cu_3Ge and Ag-Cu_3Ge-Ge. Both systems belong to simple eutectic type. The ternary eutectic points lie in." E_1, Ag(22.0)-Cu(58.8)-Ge(19.2), 632℃ and E_2 , Ag(44.3)-Cu(29.5)-Ge(26.2), 533℃. The three side binary systems were redetermined.
关键词:
phase diagram
,
null
,
null
