Preparation of BaPbO3 functional ceramics from leaded waste

Abstract

In this study, Pb was separated and used to prepare BaPbO 3 conductive ceramics from leaded waste. The experimental results show that BaPbO 3 powder synthesized at 700°C has particle size of 2-5 lm. The powders were densified by sintering at 1,000°C for 2 h in the air. Synthesized BaPbO 3 ceramics have high Curie temperature and high-temperature positive temperature coefficient (PTC) resistivity characteristics. Electrical resistivity of BaPbO 3 compact increases from 5 9 10 -6 XÁm at room temperature to 4 9 10 -4 XÁm at 750°C. Compared with the one prepared by pure chemical reagents, the BaPbO 3 prepared from leaded waste has the similar characteristics of high Curie temperature and PTC resistivity.

Numerical Simulation Study on Welding Process of Upper Frame of Hydropower Unit

“…Instead, it must be indirectly applied by modifying the thermal expansion coefficient in the material database. When the inherent strain value of the weld is known, the thermal expansion coefficient of the material can be calculated using Equation (5), which relies on the difference between the melting point of the material and the room temperature [20,26].…”

Effects of Ag Addition on Hot Deformation Behavior of Cu–Ni–Si Alloys

“…Therefore, Cu-Ni-Si alloys have many applications in aerospace and electronics industries as integrated circuit lead frame materials. Liu et al [6] calculated thermal activation energy Q ¼ 256.9 kJ mol À1 for the Cu-2.0Ni-0.5Si-0.4Cr alloy. Wang et al [5] studied the Cu-7.4Ni-1.3Si-1.2Cr alloy and found that the thermal conductivity and tensile strength was 110 W mK À1 and 820 MPa, respectively.…”