In this study, ZrO 2 thin films were coated on Co-Cr-Mo alloys by screen printing and spraying, which was followed by sintering at a high temperature of 750, 900, or 1100 °C to enhance the characteristics of the coated alloys. Through X-ray diffraction (XRD) measurements, scanning electron microscopy (SEM), surface roughness measurements, and microscale hardness testing, the structural, morphological, and mechanical characteristics of the Co-Cr-Mo alloys coated with ZrO 2 films were investigated in detail. The experimental results revealed that both the microhardness and smoothness of the ZrO 2 ceramic films prepared by screen printing and spraying methods clearly improved with increasing sintering temperature. It was also found that the increase in the sintering temperature contributes to the increased thickness and density of the films, leading to enhanced mechanical properties of the Co-Cr-Mo alloys. After sintering at 1100 °C, the ZrO 2 film prepared by spraying had the smoothest surface (surface roughness: 0.70 μm) and the highest hardness (767 HV 0.5 ). The results confirm that ZrO 2 coatings on Co-Cr-Mo alloys have high potential for medical implant applications. In addition, the sintering process is helpful for improving the mechanical properties. The ZrO 2 materials are used in many sensor applications, and sensing applications can be realized using ZrO 2 /Co-Cr-Mo materials. In the future, we will study the sensing performance of ZrO 2 sensors fabricated on Co-Cr-Mo alloys as well as implants made of the coated alloys.
In this study, a voice control model was assembled using Arduino UNO and LD3320 sensor modules, and this model was then used to create the voice control system for use in a smart drawer that could improve the convenience of daily life. We enhanced the receiving function of the voice control system to check the safety of the smart drawer, to reduce the error rate of speech recognition, and to raise the precision of supportive action. We developed carbon/carbon nanotubes (CNTs)/epoxy parts and one smart drawer with carbon fibers woven into cloth with light weight, high strength, and high tenacity. The carbon-fiber-woven cloth combined with CNTs/epoxy was stronger than those previously used in auxiliary appliances and achieved greater lightness and strength. We combined the carbon-fiber-woven cloth and CNTs/epoxy with different weight percentages of CNTs (0.5, 1, and 2 wt%) in epoxy, and manufactured test pieces of carbon/CNTs/epoxy samples with different amounts of CNTs and performed tensile, threepoint bending, and impulse tests. Finally, to reduce the weight of the drawer, we used carbon/ CNTs/epoxy components comprising the carbon-fiber-woven cloth and 1 wt% CNTs/epoxy. We created a smart drawer with voice control in this study; the drawer's switch can be controlled using voice recognition and remote control. The smart drawer is composed of a light-weight, high-strength, and high-tenacity carbon fiber/epoxy composite material with 1 wt% CNTs. The carbon/CNTs/epoxy smart drawer has the advantages of light weight, durability, controllability, and signal stability, making it ideal for use in care devices. The LD3320 sensor board combined with Arduino UNO successfully used the sound to drive the motor of the smart drawer, and the switch action can be performed.
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