To obtain novel intermediate temperature alloy solders with a melting temperature of 400-600°C,nominal（Ag-Cu28）-30Sn alloys without or with a trace addition（0.5 or 1.0 wt.%） of rare earth（RE） element La wer...To obtain novel intermediate temperature alloy solders with a melting temperature of 400-600°C,nominal（Ag-Cu28）-30Sn alloys without or with a trace addition（0.5 or 1.0 wt.%） of rare earth（RE） element La were prepared by mechanical alloying.The aim of this research is to investigate the effects of the addition of La on the microstructures,alloying process and melting properties of（Ag-Cu28）-30Sn alloys.The results show that the addition of La produces no new phase.A trace amount of La addition can effectively refine the grain size,but the excessive addition of 1.0 wt.% La inhibits the alloying process.The influence of La on the melting temperatures of solder alloys is negligible.However,the trace addition of 0.5 wt.% La can distinctly reduce the fusion zone and improve the melting property of（Ag-Cu28）-30Sn alloys.展开更多
In practice,since the measurement environments are usually complex,the electromagnetic interference problem has been an important issue for sensor applications,and the fiber sensor can overcome it effectively.this pap...In practice,since the measurement environments are usually complex,the electromagnetic interference problem has been an important issue for sensor applications,and the fiber sensor can overcome it effectively.this paper proposes a new type of vibration sensor based on fiber Bragg grating(FBG).The vibration sensor with double equal strength cantilever beams structure can further improve the measurement stability.The physical model of FBG vibration sensor was established,and the structural parameters of the double equa-strength cantilever beams were designed and optimized by finite element analysis.Both simulation and experimental tests are included in this paper to illustrate the low-frequency vibration performance of the designed vibration sensor.Among,the sensitivity of the sensor was 0.0240 pm/(m·s^(-2)),the natural frequency was 185 Hz,and the linearity was obtained,which further verify the stability and reliability of the sensor vibration frequency measurement.展开更多
基金Nanjing University of Technology for providing financial support under the BSCX grant No.200806
文摘To obtain novel intermediate temperature alloy solders with a melting temperature of 400-600°C,nominal（Ag-Cu28）-30Sn alloys without or with a trace addition（0.5 or 1.0 wt.%） of rare earth（RE） element La were prepared by mechanical alloying.The aim of this research is to investigate the effects of the addition of La on the microstructures,alloying process and melting properties of（Ag-Cu28）-30Sn alloys.The results show that the addition of La produces no new phase.A trace amount of La addition can effectively refine the grain size,but the excessive addition of 1.0 wt.% La inhibits the alloying process.The influence of La on the melting temperatures of solder alloys is negligible.However,the trace addition of 0.5 wt.% La can distinctly reduce the fusion zone and improve the melting property of（Ag-Cu28）-30Sn alloys.
基金supported by the Shanxi Young Talent Lifting Plan Foundation(No.20170512)the Natural Science Basic Research Plan in Shaanxi Province of China(No.2009JQ-491)。
文摘In practice,since the measurement environments are usually complex,the electromagnetic interference problem has been an important issue for sensor applications,and the fiber sensor can overcome it effectively.this paper proposes a new type of vibration sensor based on fiber Bragg grating(FBG).The vibration sensor with double equal strength cantilever beams structure can further improve the measurement stability.The physical model of FBG vibration sensor was established,and the structural parameters of the double equa-strength cantilever beams were designed and optimized by finite element analysis.Both simulation and experimental tests are included in this paper to illustrate the low-frequency vibration performance of the designed vibration sensor.Among,the sensitivity of the sensor was 0.0240 pm/(m·s^(-2)),the natural frequency was 185 Hz,and the linearity was obtained,which further verify the stability and reliability of the sensor vibration frequency measurement.
