Batch preparation of homogeneous size hydroxyapatite based composite ceramic microspheres

2020 ◽  
Author(s):  
Kui Zhou ◽  
Jiawei Zou ◽  
Wenchao Chi ◽  
Yanjun Lin ◽  
Wenchao Li ◽  
...  
Keyword(s):  
Composite Ceramic ◽  
Batch Preparation

scholarly journals Wetting Behavior of the Ag-5CuO Brazing Alloy on ZTA Composite Ceramic with/without CuO Coating in Air

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 609
Author(s):  
Guangjie Feng ◽  
Manqin Liu ◽  
Yalei Liu ◽  
Zhouxin Jin ◽  
Yifeng Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Triple Line ◽  
Composite Ceramic ◽  
Heating Process ◽  
Wetting Behavior ◽  
Subsequent Heating ◽  
Rich Liquid ◽  
Zirconia Toughened Alumina ◽  
Pure Al2o3

The wetting of Ag-5 wt.% CuO (Ag-5CuO) alloy on initial/CuO-coated zirconia toughened alumina (ZTA) composite ceramic in air was studied in detail. The results showed that the contact angle of the Ag-5CuO/ZTA system rapidly decreased from 81° at 970 °C to 45° at 990 °C during the heating process, however, moderate reductions in contact angle were observed in the subsequent heating and temperature holding stages. In comparison with the contact angle of pure Al2O3, an increment of about 4° of the stable contact angle of Ag-5CuO alloy on the heterogeneous ZTA was observed. The reaction between Al2O3 and CuO can reduce the damage of the CuO-rich liquid to ZrO2 in the ZTA substrate. Both oxygen and CuO were helpful in reducing the contact angle of Ag on ZTA and enhancing the bonding of the Ag/ZTA interface. The continuous CuO coating on ZTA and the monotectic liquid containing more CuO in the region near the triple line induced reductions of more than 40° and about 10° in the contact angle, respectively, between the initial and the CuO coating-improved wetting systems.

Fabrication and optical characterizations of hot-pressed transparent SrF2/Nd:SrF2/SrF2 composite ceramic

2021 ◽  
Vol 41 (1) ◽  
pp. 768-774
Author(s):  
Zuodong Liu ◽  
Shuyin Zhang ◽  
Pengyue Dong ◽  
Yu Yang ◽  
Qiqi Wang ◽  
...  
Keyword(s):  
Composite Ceramic

The preparation of ZrO2-Al2O3 composite ceramic by SLA-3D printing and sintering processing

2020 ◽  
Vol 46 (1) ◽  
pp. 937-944 ◽  
Author(s):  
Xiaoyan Liu ◽  
Bin Zou ◽  
Hongyu Xing ◽  
Chuanzhen Huang
Keyword(s):  
3D Printing ◽  
Composite Ceramic ◽  
Al2o3 Composite

scholarly journals Modelling time efficiency of cobot-supported kit preparation

2019 ◽  
Vol 106 (5-6) ◽  
pp. 2227-2241 ◽  
Author(s):  
Patrik Fager ◽  
Martina Calzavara ◽  
Fabio Sgarbossa
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Cycle Time ◽  
Laboratory Experiments ◽  
Spare Parts ◽  
Batch Preparation ◽  
Assembly Quality ◽  
Numerical Example ◽  
Business To Business ◽  
Support Time

AbstractKitting – meaning to supply assembly with components in presorted kits – is widely seen as beneficial for assembly quality and efficiency when there is a multitude of component variants. However, the process by which kits are prepared – the kit preparation – is labour-intensive, and kit errors are problematic at assembly processes. The use of robotics to support kit preparation has received some attention by researchers, but literature is lacking with respect to how collaborative robots – cobots – can support kit preparation activities. The purpose of this paper is to identify the potential of a cobot to support time-efficient batch preparation of kits. To address the purpose, the paper presents a mathematical model for estimation of the cycle time associated with cobot-supported kit preparation. The model is applied in a numerical example with experimental data from laboratory experiments, and cobot-supported kit preparation is compared with manual kit preparation. The findings suggest that cobot-supported kit preparation is beneficial with diverse kits and smaller components quantities per SKU (Stock Keeping Unit) and provides less variability of the outcome, when compared to manual kit preparation. The paper reveals several insights about cobot-supported kit preparation that can be valuable for both academics and practitioners. The model developed can be used by practitioners to assess the potential of cobots to support kit-batch preparation in association with assembly, spare parts, repair and maintenance, or business to business industry.

Preparation and Performance of Ni-YSZ/YSZ Co-Ceramic Using Multiple Gel-Tape Casting

2012 ◽  
Vol 512-515 ◽  
pp. 1555-1558
Author(s):  
Zhong Zhou Yi ◽  
Feng Rui Zhai ◽  
Hong Tian ◽  
Zhi Peng Xie
Keyword(s):  
Expansion Coefficient ◽  
Tape Casting ◽  
Composite Ceramic ◽  
Hydrogen Atmosphere ◽  
Intermediate Temperature ◽  
Layer Composite ◽  
Ceramic Disk ◽  
Sem Micrograph ◽  
And Performance ◽  
Fuel Cell Anode

Use starch, corn meal and activated carbon as pore-making agent, Ni-YSZ/YSZ composite ceramic green body was prepared by multiple gel-tape casting with acryloyl ammonium-polyvinyl alcohol. The specimen was sintered at 1450°C for 4h, then reduced in hydrogen atmosphere at 800°C for 4h, Ni-YSZ/YSZ composite ceramic disk was obtained, the porosity, thermal expansion coefficient, electrical properties and microstructures of the specimen was tested. The results showed that the porosity of Ni-YSZ/YSZ composite ceramic disk reaches about 30% when use starch as pore-making agent, expansion coefficient is proportional to porosity, both of them reduced with the temperature increased. The YSZ is continued and compact with network structure, Ni particulates are well distributed in it, suitable for intermediate temperature solid oxide fuel cell anode materials. Image analysis of SEM micrograph showed that the structure is loose, porous, uniform and compact in Ni/YSZ/YSZ multi-layer composite ceramics, which meet the requirement of intermediate temperature SOFC.

Finite Element Analysis of Composite Ceramic-Concrete Slab Constructions Exposed to Fire

2016 ◽  
Vol 861 ◽  
pp. 88-95
Author(s):  
Balázs Nagy ◽  
Elek Tóth
Keyword(s):  
Composite Structures ◽  
Elevated Temperatures ◽  
Cfd Simulation ◽  
Concrete Slab ◽  
Composite Ceramic ◽  
Reinforced Concrete Beam ◽  
Element Analysis ◽  
Standard Fire ◽  
Using Data ◽  
Dynamics Simulations

In this research, conjugated thermal and fluid dynamics simulations are presented on a modern hollow clay slab blocks filled pre-stressed reinforced concrete beam slab construction. The simulation parameters were set from Eurocode standards and calibrated using data from standardized fire tests of the same slab construction. We evaluated the temperature distributions of the slabs under transient conditions against standard fire load. Knowing the temperature distribution against time at certain points of the structure, the loss of load bearing capacity of the structure is definable at elevated temperatures. The results demonstrated that we could pre-establish the thermal behavior of complex composite structures exposed to fire using thermal and CFD simulation tools. Our results and method of fire resistance tests can contribute to fire safety planning of buildings.

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