Lead-free low melting glasses,ZnO-CuO-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)system,with fixed contents of 15 mol%CuO and 20 mol%Bi_(2)O_(3),were prepared by using melt cooling method.Structure and thermal properties of the gl...Lead-free low melting glasses,ZnO-CuO-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)system,with fixed contents of 15 mol%CuO and 20 mol%Bi_(2)O_(3),were prepared by using melt cooling method.Structure and thermal properties of the glasses were studied by using X-ray diffractometer(XRD),infrared spectrometer(FIT-IR),thermal dilatometer and differential thermal analyzer(DTA).Chemical durability of the glasses was studied by using dissolution rate method.Wettability of glasses on substrate was tested by using button sintering experiment.It is found that alkaline resistance of the glass solders is lower than that of plate glass and the water resistance is comparable with that of plate glass.The sealing temperatures are Ts=445-490℃,while the average thermal expansion coefficient from room temperature to 300℃is in the range of(65-82)×10^(−7)℃^(−1).At sealing temperature,the glass solders have good wettability on plate glass or alumina substrate.They are not crystallized even sintered at the sealing temperature for 30 min.The solder glasses are suitable for sealing plate glass,alumina and other inorganic non-metallic materials.展开更多
将端氨基超支化聚酰胺(HBPN)作为高吸收铬鞣助剂应用于铬鞣工序中,考察其用量对铬的吸收率、蓝湿革的收缩温度(Ts)、变性温度(Td)和热降解活化能(E)的影响。结果表明,当HBPN的用量为酸皮重的1%时,铬的吸收率可达83.5%,比空白组提高了31...将端氨基超支化聚酰胺(HBPN)作为高吸收铬鞣助剂应用于铬鞣工序中,考察其用量对铬的吸收率、蓝湿革的收缩温度(Ts)、变性温度(Td)和热降解活化能(E)的影响。结果表明,当HBPN的用量为酸皮重的1%时,铬的吸收率可达83.5%,比空白组提高了31.7%。蓝湿革的Ts从97.4℃提高到105.9℃,Td从112.47℃提高到116.63℃,变性焓从129.2 J/g提高到222.7 J/g。基于Flynn-Wall-Ozawa法和Kissinger法的分析结果,蓝湿革的E值分别为169.524~196.668 k J/mol和153.314 k J/mol,高于空白组的147.244 k J/mol。上述研究结果证实,在铬鞣工序中使用HBPN,可以提高铬的吸收率和蓝湿革的湿热稳定性。HBPN是一种具有较高应用潜力的高吸收铬鞣助剂。展开更多
基金National Natural Science Foundation of China(52172070)Jiangxi Provincial Natural Science Foundation(20242BAB25222)Jiangxi Provincial Graduate Innovation Special Fund Project(YC2022-S882 and YC2023-S808).
文摘Lead-free low melting glasses,ZnO-CuO-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)system,with fixed contents of 15 mol%CuO and 20 mol%Bi_(2)O_(3),were prepared by using melt cooling method.Structure and thermal properties of the glasses were studied by using X-ray diffractometer(XRD),infrared spectrometer(FIT-IR),thermal dilatometer and differential thermal analyzer(DTA).Chemical durability of the glasses was studied by using dissolution rate method.Wettability of glasses on substrate was tested by using button sintering experiment.It is found that alkaline resistance of the glass solders is lower than that of plate glass and the water resistance is comparable with that of plate glass.The sealing temperatures are Ts=445-490℃,while the average thermal expansion coefficient from room temperature to 300℃is in the range of(65-82)×10^(−7)℃^(−1).At sealing temperature,the glass solders have good wettability on plate glass or alumina substrate.They are not crystallized even sintered at the sealing temperature for 30 min.The solder glasses are suitable for sealing plate glass,alumina and other inorganic non-metallic materials.
文摘将端氨基超支化聚酰胺(HBPN)作为高吸收铬鞣助剂应用于铬鞣工序中,考察其用量对铬的吸收率、蓝湿革的收缩温度(Ts)、变性温度(Td)和热降解活化能(E)的影响。结果表明,当HBPN的用量为酸皮重的1%时,铬的吸收率可达83.5%,比空白组提高了31.7%。蓝湿革的Ts从97.4℃提高到105.9℃,Td从112.47℃提高到116.63℃,变性焓从129.2 J/g提高到222.7 J/g。基于Flynn-Wall-Ozawa法和Kissinger法的分析结果,蓝湿革的E值分别为169.524~196.668 k J/mol和153.314 k J/mol,高于空白组的147.244 k J/mol。上述研究结果证实,在铬鞣工序中使用HBPN,可以提高铬的吸收率和蓝湿革的湿热稳定性。HBPN是一种具有较高应用潜力的高吸收铬鞣助剂。
