sPreparation of ZrO 2 beads by an improved micro‐droplet spray forming process

2021 ◽  
Author(s):  
Jun Chen ◽  
Wan‐Qing Xue ◽  
Chang‐Ming Xu ◽  
Pai‐Feng Luo ◽  
Ji‐Gui Cheng ◽  
...  
Keyword(s):  
Spray Forming ◽  
Forming Process ◽  
Droplet Spray

Thermal Modeling of Deposit Solidification in Uniform Droplet Spray Forming

1997 ◽  
Vol 119 (3) ◽  
pp. 332-340 ◽  
Author(s):  
P. Acquaviva ◽  
Chen-An Chen ◽  
Jung-Hoon Chun ◽  
Teiichi Ando
Keyword(s):  
Thermal State ◽  
Liquid Fraction ◽  
Solidification Process ◽  
Spray Forming ◽  
Forming Process ◽  
Material Microstructure ◽  
Precise Control ◽  
Uniform Droplet Spray ◽  
Droplet Spray ◽  
Uniform Droplet

In spray forming, the deposit thermal state is a key parameter which influences the microstructural evolution upon and after droplet impact onto the deposit. The uniform droplet spray (UDS) forming process has been developed to enable precise control of the droplet and deposit thermal state and the resultant material microstructure. By having a uniform droplet size throughout the spray, all the droplets deposited onto the substrate will have the same thermal state upon impact, allowing for precise control of the solidification process. This paper describes a one-dimensional, finite difference model that predicts the temperature and liquid fraction of the deposit during the UDS process. The model employs an explicit temperature-enthalpy method to incorporate a variety of solidification models. Experiments were conducted using Sn-15 wt percent Pb binary alloy. Temperatures were measured in the deposit and acceptable agreement with the simulation was obtained. Modeling has shown that the deposit thermal state is highly dependent on variations in spray conditions, which are predicted using droplet trajectory and droplet thermal models. Using the droplet and deposit models, the relationship between UDS process parameters and material microstructure can be understood.

Study on Nitridation Behavior of Mg-Ca Alloy under Nitrogen

2011 ◽  
Vol 415-417 ◽  
pp. 1127-1131
Author(s):  
Xiao Xia Yang ◽  
Dun Qiang Tan ◽  
Dong Fei Xiao ◽  
Yi Jie Zhan
Keyword(s):  
Magnesium Alloy ◽  
Profile Analysis ◽  
Surface Film ◽  
Spray Forming ◽  
Holding Time ◽  
Mg Alloy ◽  
Nitride Film ◽  
Forming Process ◽  
Small Cracks

To study the ignition-proof behavior in the spray deposited magnesium alloy with nitrogen as atomizing gas, SEM and XRD were employed to study the morphology and elements profile of nitride film formed on the Mg-5Ca alloy melt in different conditions, and the ignition proof principle was also analyzed preliminarily. The results indicated that under ordinary nitrogen (99.5%), a layer of smooth and continuous nitride film was formed on the surface of Mg-5Ca alloy after sintered at 740°C for 2 hours, and with the increasing of temperature and holding time, small cracks and cavities appeared locally on the surface film. The surface film was mainly composed of CaO、MgO、Ca3N2and Mg3N2.The profile analysis of the nitride film indicated that Ca element collected on the surface of the nitride film, and a multiple film was formed which filled the loose and holes of single film, avoided the burning of Mg alloy during spray forming process.

Modeling of Flow Fields of Different Delivery Chamfers in Spray Forming Process

2014 ◽  
Vol 789 ◽  
pp. 554-559
Author(s):  
Yang Liu ◽  
Zhou Li ◽  
Guo Qing Zhang ◽  
Wen Yong Xu
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
Fluid Dynamic ◽  
Metal Flow ◽  
Spray Forming ◽  
Operating Pressure ◽  
Delivery Tube ◽  
Forming Process ◽  
Atomization Process ◽  
Sharp Point

The computational fluid dynamic (CFD) software was used to calculate the velocity field in atomization chamber of spray forming equipment. The relationship between melt flow rates, gas aspiration of the atomizer and operating pressure are complex, and the above mentioned parameters are closely related to the atomization process. The influences of different delivery chamfers on gas flow field, which is determined by atomizer structure, were analyzed. Using K-epsilon model with a symmetrical domain, the gas dynamic of different delivery chamfer conditions were investigated. The results indicate that the sharp point of delivery tube causes detachment of flow field, and 56°, 45° and 34° chamfer conditions have same diffusion angle. Gas was aspirated from delivery tube when chamfer was 0°, which is beneficial to liquid metal flow in atomization process.

Study on FGH95 Superalloy Prepared by Spray Forming

2011 ◽  
Vol 337 ◽  
pp. 434-438
Author(s):  
Yi Xu ◽  
Shu Qin
Keyword(s):  
Technological Parameter ◽  
Nonmetallic Inclusions ◽  
Preparation Method ◽  
Spray Forming ◽  
Forming Process ◽  
Cylindrical Billet ◽  
Phase Size ◽  
The Difference ◽  
Cooling Velocity ◽  
Fgh95 Superalloy

FGH95 superalloy cylindrical billet was prepared by spray forming, The yield is 73.6%, porosity is 0.6%, the oxygen content is only 20ppm. Spray forming preparation method and technological parameter were illustrated. The microstructure on the different positions of billet were observed. The results show that the difference of γ′ phase size, feature and distribution depend on different cooling velocity and local temperature difference during the spray forming process. SEM of nonmetallic inclusions were observed, and XPS of nonmetallic inclusions, nozzle and adhesive were analysed, the results show that the nonmetallic inclusions were from nozzle and adhesive.

Mg–Cu–Gd layered composite plate synthesized via the spray forming process

2008 ◽  
Vol 477 (1-2) ◽  
pp. 58-62 ◽  
Author(s):  
K.F. Chang ◽  
M.-L.T. Guo ◽  
R.H. Kong ◽  
Chi Y.A. Tsao ◽  
J.C. Huang ◽  
...  
Keyword(s):  
Composite Plate ◽  
Spray Forming ◽  
Layered Composite ◽  
Forming Process

Effects of Atomizing Gas on Microstructural Characteristics and Mechanical Properties of Spray Formed High Si Steels

2009 ◽  
Vol 620-622 ◽  
pp. 57-60
Author(s):  
Je Sik Shin ◽  
Bong Hwan Kim ◽  
J.G. Lee ◽  
Seung Y. Shin ◽  
Gwang Bo Choi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spray Forming ◽  
Forming Process ◽  
Microstructural Characteristics ◽  
Steel Sheets ◽  
Conventional Ingot ◽  
Cold Workability ◽  
Ingot Cast

In order to investigate the feasibility of spray forming process for production of high Si steel sheets, 4.8~6.4%Si steels were prepared by spray forming process using N2 and Ar gases and their cold workability was compared with that of conventional ingot cast samples. Atomizing gas affected significant effect on deposit features, microstructural characteristics and mechanical properties of the spray formed high Si steels.

The Electric Arc Spray Manufacture of Rapid Production Tooling: A Case Study

1998 ◽  
Author(s):  
A.P. Newbery ◽  
P.S. Grant ◽  
R.M. Jordan ◽  
A.D. Roche ◽  
T.C. Carr
Keyword(s):  
Injection Moulding ◽  
Low Cost ◽  
Spray Forming ◽  
Electric Arc ◽  
Internal Stresses ◽  
Forming Process ◽  
Polymer Injection ◽  
Spray Process ◽  
Arc Spray ◽  
The U.S

Abstract The manufacture of tooling using the electric arc spray process to spray steel directly onto a master pattern offers substantial reductions in the lead times required to make complex tooling for polymer injection moulding and other applications. The process of spray forming is fast, efficient, and low cost, and has been shown to be dimensionally accurate with proper control over the residual stresses that develop during spraying. Poor dimensional control because of high internal stresses in thick arc sprayed steel coatings is well known, but these problems can be avoided by the use of correct spraying conditions. This paper describes the STD SPRAYFORM process for the manufacture of tooling for the polymer injection moulding of a component for a leading company in the U.S. The steps in the spray forming process, both before and after spraying, are described. The spray forming route competed directly with a traditional method for toolmaking and considerably reduced the lead time from order to completion. The tooling produced by spray forming has been operating commercially in production in the U.S. and has to date produced in the region of half a million parts without appreciable wear. The incorporation of contoured cooling channels during spraying has enabled plastic injection moulding cycle times to be decreased by 15%.

Mathematical Simulation of Billet Profile during Spray Forming Process

2007 ◽  
pp. 1961-1966
Author(s):  
San Bing Ren ◽  
Jun Fei Fan ◽  
Hai Rong Le ◽  
Shun Li Zhao
Keyword(s):  
Mathematical Simulation ◽  
Spray Forming ◽  
Forming Process

Production and Properties of a 90%Si-Al Alloy for Electronic Packaging Applications

2009 ◽  
Vol 610-613 ◽  
pp. 542-545 ◽  
Author(s):  
Kun Yu ◽  
Chao Li ◽  
Jun Yang ◽  
Zhi Yong Cai
Keyword(s):  
Physical Properties ◽  
Electronic Packaging ◽  
Heat Dissipation ◽  
Thermal Conductivity Coefficient ◽  
Coefficient Of Thermal Expansion ◽  
Spray Forming ◽  
Al Alloy ◽  
Scanning Electronic Microscopy ◽  
Alloy Specimen ◽  
Forming Process

The high silicon content Si-Al alloy is a typical heat dissipation material that used in the electrical packaging field. A spray forming process wais used to produce a 90%Si-Al alloy specimen as a heat dissipation material in the present study. Then the spray formed 90%Si-Al specimens weare hot pressed at 1000°C with different pressure ranged from 2MPa to 10MPa to increase their density. The physical properties of the experimental alloy specimen weare measured. And the microstructure wass are observed by using optical microscopy and scanning electronic microscopy. The results showed that the Spray forming wais suitable forto producinge a 90%Si-Al alloy. With hot pressure of 10MPa, the relative density value of 90%Si-Al reachedcan obtain 94%. The typical physical properties such as the thermal conductivity, coefficient of thermal expansion and electrical conductivity of 90%Si-Al alloy are acceptable as a heat dissipation material for many electronic packaging applications.

Multilayer Spray Forming Process and Setup

1996 ◽  
Vol 217-222 ◽  
pp. 317-322 ◽  
Author(s):  
Zhen Hua Chen ◽  
Pei Yun Huang ◽  
Xiangyang Jiang ◽  
Yun Wang ◽  
Chan Qun Peng ◽  
...  
Keyword(s):  
Spray Forming ◽  
Forming Process
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