Fabrication of Stainless Steel Foams Using Polymeric Sponge Impregnation Technology

2014 ◽  
Vol 1035 ◽  
pp. 219-224 ◽  
Author(s):  
Hui Wang ◽  
Xiang Yang Zhou ◽  
Bo Long
Keyword(s):  
Stainless Steel ◽  
Apparent Density ◽  
Open Porosity ◽  
316L Stainless Steel ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Foam Sample ◽  
Cell Network ◽  
Mass Fractions ◽  
Steel Foam

316L stainless steel foams (SSFs) are fabricated successfully by polymeric sponge impregnation technology. The effects of mass fractions of PVA and powder on LOAD in impregnated sponge samples are investigated, and the effects of sintering temperature on apparent density, open porosity and bending strength of SSFs samples are also discussed. The experimental results show that the impregnated sponge samples may hold excellent 3D open-cell network structure and uniform muscles when the mass fractions of PVA and powder in slurry are kept in 9-13 % and 52-75% respectively; with rising the sintering temperature, the apparent density and bending strength of SSFs gradually increases, the open porosity reduces. After the temperature exceeds 1260°C, the bending strength reduces oppositely. A stainless steel foam sample with open porosity of 81.4% and bending strength of about 56.8 Mpa can be obtained after sintering at 1260 °Cfor 30min.

PREPARATION OF Bi2O3-DOPED NiO/YSZ ANODE MATERIALS FOR SOFCs

2017 ◽  
Vol 24 (07) ◽  
pp. 1750092 ◽  
Author(s):  
FEI LI ◽  
JINGDE ZHANG ◽  
JUNPENG LUAN ◽  
YALEI LIU ◽  
JIANXUN HAN
Keyword(s):  
Weight Loss ◽  
Open Porosity ◽  
Anode Materials ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Sintering Aids ◽  
Dry Pressing ◽  
Sintering Properties ◽  
Cubic Structure ◽  
The Cost

The NiO/YSZ anode materials of SOFCs with Bi2O3 as sintering aids were successfully prepared by dry-pressing process. The effects of Bi2O3 content on the sintering properties of NiO/YSZ anode materials were studied, including the effects on the density, open porosity, weight loss, phase composition, microstructure, mechanical strength and electrical conductivity. In particular, the weight loss, relative density and bending strength of the sintered NiO/YSZ ceramics increased with the increase of Bi2O3 content while the open porosity decreased gradually. The density of the NiO–YSZ ceramics with 6[Formula: see text]wt.% Bi2O3 sintered at 1250[Formula: see text]C could reach that of the ceramics without Bi2O3 sintered at 1400[Formula: see text]C. For Bi2O3 concentration higher than 6[Formula: see text]wt.%, phase transformation of zirconia from monoclinic to cubic structure occurs, causing volume change and microcracks in the anode materials. Therefore, the optimum adding amount of Bi2O3 is 6[Formula: see text]wt.%, which can reduce the sintering temperature to 1250[Formula: see text]C. The ceramics with 6[Formula: see text]wt.% Bi2O3 have relatively high bending strength and low sintering temperature. This is of great significance for improving the performance of the anode and cutting the cost.

Fabrication Processes and Properties of Highly Pure MgAlON Materials

2007 ◽  
Vol 561-565 ◽  
pp. 543-546 ◽  
Author(s):  
Qing Huang ◽  
Yong Huang ◽  
Chang An Wang ◽  
Hou Xing Zhang
Keyword(s):  
Spark Plasma Sintering ◽  
Open Porosity ◽  
Single Phase ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Hot Press ◽  
Plasma Sintering ◽  
Short Period ◽  
Spark Plasma ◽  
Hot Press Sintering

In this paper, the MgAlON ceramic was fabricated by Spark Plasma Sintering (SPS) and hot press sintering respectively. The results showed that highly pure and single-phase MgAlON could be fabricated at lower sintering temperature in a short period through SPS process, compared with the conventional Hot Press sintering (HP) process. The bending strength of MgAlON specimens prepared by SPS process was higher than 500MPa while bending strength of HP specimens was much lower. The open porosity was almost eliminated in SPS MgAlON specimens. Spark Plasma Sintered MgAlON had a single phase of MgAlON while Hot Press Sintered MgAlON had major MgAlON and minor AlN and Al2O3.

Experimental Study on Drying Process of Green Body in Gelcasting of Metal Part

2012 ◽  
Vol 217-219 ◽  
pp. 1894-1898
Author(s):  
Hui Huang Liang ◽  
Fei Wang ◽  
Kai Yong Jiang
Keyword(s):  
Stainless Steel ◽  
Freeze Drying ◽  
316L Stainless Steel ◽  
Bending Strength ◽  
Fine Particles ◽  
Solid Loading ◽  
Green Body ◽  
Drying Process ◽  
Metal Part ◽  
Study Results

In this paper, gelatin was selected as binder, sodium alginate as dispersant. The slurries with low viscosity and high solid loading were prepared by mixing two types of 316L stainless steel powders with different particle sizes in proper mass ratios. The freeze drying process was adopted to treat the wet green body. The results show that the slurry with a solid loading as high as 58 vol.% can be obtained by mixing 316L stainless steel powders with mass ratio of fine particles to coarse as 4:6, which has better fluidity and densification. The viscosity of the slurry is less than 1Pa•s. After the freeze drying process, the bending strength of green body reaches 11.15MPa, the drying shrinkage is decreased to 0.44%, and the generation of crack can be prevented. The study results provide some helpful references for further research in rapid manufacturing of complex metal part.

Debinding of stainless steel foam precursor with 3-D open-cell network structure

2010 ◽  
Vol 20 (12) ◽  
pp. 2340-2344 ◽  
Author(s):  
Chang-lin LI ◽  
Hui WANG ◽  
Xiang-yang ZHOU ◽  
Jie LI ◽  
Hong-zhuan LIU
Keyword(s):  
Stainless Steel ◽  
Network Structure ◽  
Open Cell ◽  
Cell Network ◽  
Steel Foam

scholarly journals Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6504
Author(s):  
Javier Bedmar ◽  
Ainhoa Riquelme ◽  
Pilar Rodrigo ◽  
Belen Torres ◽  
Joaquin Rams
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Fiber Laser ◽  
Co2 Laser ◽  
316L Stainless Steel ◽  
Bending Strength ◽  
Fracture Strain ◽  
Steel Powder ◽  
Fracture Mechanisms ◽  
Direct Laser

In additive manufacturing (AM), the technology and processing parameters are key elements that determine the characteristics of samples for a given material. To distinguish the effects of these variables, we used the same AISI 316L stainless steel powder with different AM techniques. The techniques used are the most relevant ones in the AM of metals, i.e., direct laser deposition (DLD) with a high-power diode laser and selective laser melting (SLM) using a fiber laser and a novel CO2 laser, a novel technique that has not yet been reported with this material. The microstructure of all samples showed austenitic and ferritic phases, which were coarser with the DLD technique than for the two SLM ones. The hardness of the fiber laser SLM samples was the greatest, but its bending strength was lower. In SLM with CO2 laser pieces, the porosity and lack of melting reduced the fracture strain, but the strength was greater than in the fiber laser SLM samples under certain build-up strategies. Specimens manufactured using DLD showed a higher fracture strain than the rest, while maintaining high strength values. In all the cases, crack surfaces were observed and the fracture mechanisms were determined. The processing conditions were compared using a normalized parameters methodology, which has also been used to explain the observed microstructures.

scholarly journals Preparation of gradient Ni-SDC anode by tape casting and co-sintering

2010 ◽  
Vol 42 (2) ◽  
pp. 153-159 ◽  
Author(s):  
X.B. Li ◽  
H.Y. Wang ◽  
H.X. Gu ◽  
J. Wang ◽  
W.J. Zhang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Open Porosity ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Tape Casting ◽  
Sintering Process ◽  
Casting Method ◽  
Better Than

Gradient Ni-SDC anode and anode-supported SDC electrolyte were produced by tape casting method with laminating and co-sintering process. The best co-sintering temperature of gradient Ni-SDC anode and SDC electrolyte was 1300?C for 3 h. The open porosity of gradient Ni-SDC anode sintered at 1300oC was 36%, which offered sufficient open porosity of more than 30%. By adjusting the composition of Ni in gradient anode, the thermal expansion coefficient (TEC) of Ni-SDC anode could be adjusted close to that of SDC electrolyte, which improve the compatibility of anode and electrolyte. The bending strength of gradient Ni-SDC anode was 134 MPa. The electrical conductivity of gradient Ni-SDC anode was better than that of non-gradient Ni-SDC anode at 650 - 800?C.

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