Zirconia Powder for TZP-Ceramics Ti-Y-TZP

Zirconia’88 ◽  
1989 ◽  
pp. 119-129 ◽  
Author(s):  
H. Hofmann ◽  
B. Michel ◽  
L. J. Gauckler
Keyword(s):  
Zirconia Powder

ZIRCAR ZIRCONIA POWDER TYPE ZYP-4.5

Alloy Digest ◽  
1989 ◽  
Vol 38 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Yttrium Oxide ◽  
Zirconium Oxide ◽  
Raw Material ◽  
Bend Strength ◽  
Powder Metal ◽  
Zirconia Powder ◽  
Tetragonal Crystal ◽  
Powder Type

Abstract ZIRCAR ZIRCONIA POWDER TYPEZYP-4.5 is a highly reactive form of zirconium oxide stabilized in the tetragonal crystal state with added yttrium oxide. It is an excellent raw material for producing dense structural and wear resistant parts. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and bend strength as well as fracture toughness. It also includes information on powder metal forms. Filing Code: Cer-1. Producer or source: Zircar Products Inc..

Surface Modification of High Density Ceramic Powder for Increasing Suspension Capacity in Three-Dimensional Printing Application

2018 ◽  
Vol 936 ◽  
pp. 159-163 ◽  
Author(s):  
Huang Jan Hsu ◽  
Shyh Yuan Lee ◽  
Shinn Liang Chang ◽  
Cho Pei Jiang
Keyword(s):  
Surface Modification ◽  
Ball Milling ◽  
Ceramic Powder ◽  
Three Dimensional ◽  
Treatment Protocol ◽  
Weight Ratio ◽  
Average Diameter ◽  
Zirconia Powder ◽  
Three Dimensional Printing ◽  
Promising Tool

Three-dimensional slurry printing is a promising tool for making ceramic object but it limits in high dense ceramic powder because of poor suspension capacity. This study uses zirconia powder with an average diameter of 2 μm because its density is 5.67 g/cm3. A treatment protocol is proposed to improve the suspension capacity of zirconia powder including the ball milling, surface modification and resin blending. Experimental results show that adding 1% of isostearyl titanate, a coupling agent, for surface modification can enhance the lipophilicity of zirconia powder. Mixing surface modification powder in resin with a weight ratio of 7:3 and carrying on ball milling with 100 RPM for 6 hours can obtain the diameter of powder less than 400 nm. As a result, the zirconia slurry can obtain good suspension capacity which is over 48 hours.

Graded coatings by gradient temperature densification

1998 ◽  
Vol 13 (5) ◽  
pp. 1255-1259 ◽  
Author(s):  
Sung Kang Hur ◽  
Sang H. Yoo ◽  
Joanna R. Groza ◽  
Jung Man Doh ◽  
Kazuo Yamazaki ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Sintering Temperature ◽  
Zirconia Powder ◽  
Fine Grained ◽  
Functionally Gradient ◽  
Intermediate Layers ◽  
Graded Coatings ◽  
Ceramic Sintering ◽  
Field Assisted Sintering ◽  
Short Time

Functionally gradient materials (FGM) were prepared using layers of ZrO2 –3 mol% Y2O3 ceramic and NiCrAlY powders. A fine-grained zirconia powder was chosen to lower the ceramic sintering temperature and achieve simultaneous metal and ceramic densification. Consolidation of FGM's was achieved by a short time field-assisted sintering technique. Sintering was performed either at a constant temperature or in a temperature gradient by using punches made of different materials (i.e., one graphite and one tungsten). A temperature gradient of at least 100 °C was required with a low value of 1200 °C at the metal end and exceeding 1300 °C at the ceramic end. Increasing the number of intermediate layers alleviates some of the cracks formed during sintering due to different coefficients of thermal expansion.

scholarly journals A novel green nonaqueous sol-gel process for preparation of partially stabilized zirconia nanopowder

2017 ◽  
Vol 11 (3) ◽  
pp. 220-224 ◽  
Author(s):  
Guo Feng ◽  
Weihui Jiang ◽  
Jianmin Liu ◽  
Quan Zhang ◽  
Qian Wu ◽  
...  
Keyword(s):  
Bending Strength ◽  
Sol Gel ◽  
Sintered Sample ◽  
Zirconium Oxychloride ◽  
Bet Surface Area ◽  
Nanometer Scale ◽  
Stabilized Zirconia ◽  
Zirconia Powder ◽  
Sol Gel Process ◽  
Sintering Behaviour

A novel green nonaqueous sol-gel process was developed to prepare 3mol% Y2O3-doped ZrO2 nanopowder from zirconium oxychloride and without need for washing of the obtained particles. It was shown that highly dispersive nanometer-scale zirconia powder with the particle size of 15-25 nm and BET surface area of 41.2m2/g can be prepared. The sintering behaviour was also investigated. Density of the translucent body sintered at 1400?C is 98.7 ? 0.3% of its theoretical density and the surface and cross section areas are dense without holes or other defects. The bending strength of the sintered sample is 928 ? 64MPa.

Raman spectra of tetragonal zirconia: powder to zircaloy oxide frequency shift

2001 ◽  
Vol 288 (2-3) ◽  
pp. 241-247 ◽  
Author(s):  
Pierre Barbéris ◽  
Gaëlle Corolleur-Thomas ◽  
René Guinebretière ◽  
Thérèse Merle-Mejean ◽  
Andrei Mirgorodsky ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Raman Spectra ◽  
Tetragonal Zirconia ◽  
Zirconia Powder

Modification Effect of Nanometre Zirconia on Ca-PSZ Ceramics

2019 ◽  
Vol 953 ◽  
pp. 59-64
Author(s):  
Liang Zhao ◽  
Shuang Yao ◽  
Jing Du
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Raw Materials ◽  
Inhibitory Effect ◽  
Transgranular Fracture ◽  
Zirconia Ceramics ◽  
Zirconia Powder ◽  
Abnormal Growth ◽  
Crystalline Fracture ◽  
The Relationship

The modified calcium oxide partially stabilized zirconia ceramics were fabricated using ZrO2 powder as raw materials, CaO as stabilizer, and nanometre zirconia as modification agent. The relationship between additive amount of nanometre zirconia and the performance of Ca-PSZ ceramics were researched via testing the physical properties, analyzing mineral phase composition, and observing microstructure of the samples. The results show that the introduction of nanometre zirconia powder has a significant effect on the physical properties of Ca-PSZ, with an addition of 8wt%, bulk density was up to 5.08 g/cm3, and the compressive strength reached 381 MPa. Compared with the unmodified Ca-PSZ sample, the porosity of the modified Ca-PSZ samples decreased by 40%, and the compressive strength increased by 70%. The introduction of nanometre zirconia has an inhibitory effect on the abnormal growth of zirconia grains and improves the densification of the Ca-PSZ ceramics. Through the formation of intragranular structure, nanometre zirconia can induce transgranular fracture and weaken crystalline fracture, thereby increasing the strength of the Ca-PSZ ceramics.

Corrosion Resistance of Partially Stabilized Zirconia Materials to Alkaline Steel Slag

2020 ◽  
Vol 852 ◽  
pp. 119-128
Author(s):  
Liang Zhao ◽  
Qian Huang ◽  
Hua Yin Sun ◽  
Xiang Li
Keyword(s):  
Corrosion Resistance ◽  
Steel Slag ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Zirconia Powder ◽  
Slag Film ◽  
Partially Stabilized Zirconia ◽  
Stabilizing Agents ◽  
The Relationship

Partially stabilized zirconia (PSZ) materials were fabricated using 4 wt% CaO, 3 wt% MgO, and 5.4 wt% Y2O3 as stabilizing agents together with monoclinic zirconia powder. The physical properties, phase compositions, and microstructures of the Ca-PSZ, Mg-PSZ, and Y-PSZ samples were investigated by X-ray diffraction, scanning electron microscopy, and energy spectrum analysis. A crucible method was used to explore the relationship between the stabilizing agent and erosion resistance to alkaline steel slag. The results revealed that the zirconia materials stabilized by different stabilizing agents showed obvious differences in their bulk densities, apparent porosities, microstructures, and erosion resistances to alkaline steel slag. The structure of Y-PSZ showed highest density, containing a small number of uniformly distributed pores. In terms of Mg-PSZ, the intergranular bonding in its structure was observed to not be close, and the sample contained some cracks, but no pores. A large number of intragranular pores and a small number of overall pores was observed in Ca-PSZ, resulting in this material having the lowest bulk density. The pores and cracks provide the path to penetrate and diffuse for alkaline steel slag, which weakens the corrosion resistance of PSZ materials. The phase composition of the affected layers in all of the samples after corrosion was almost completely transformed from monoclinic phase to cubic phase, and the phase transition of both the original and transition layers was not obvious due to the formation of a slag film. Y-PSZ did not react with components of the steel slag such as SiO2 and Al2O3, showing the best corrosion resistance to alkaline steel slag.

Microwave Absorbency Change of Zirconia Powder and Fiber during Vacuum Heating

2010 ◽  
Vol 63 ◽  
pp. 85-90 ◽  
Author(s):  
Saburo Sano ◽  
Shoji Kawakami ◽  
Yasumasa Takao ◽  
Sadatsugu Takayama ◽  
Motoyasu Sato
Keyword(s):  
Microwave Absorption ◽  
Stoichiometric Composition ◽  
Wave Guide ◽  
Stabilized Zirconia ◽  
Zirconia Powder ◽  
Partially Stabilized Zirconia ◽  
Zro2 Powder ◽  
Zirconia Fiber ◽  
Vacuum Heating ◽  
Absorption Measurements

Stabilized zirconia shows rather high microwave absorbency at room temperature, and the absorbency become higher with increasing temperature. In this study, stabilized zirconia powder, partially stabilized zirconia powder and zirconia fiber were subjected for microwave absorption measurements at elevated temperature. Microwave absorption measurements were done by using a system consists of a microwave vector network analyzer, a circular wave-guide fixture and a vacuum furnace. Microwave absorbency was evaluated by the reflection power change from the sample in the circular wave-guide fixture under vacuum heating. Microwave absorbency of stabilized zirconia powder, partially stabilized zirconia powder and zirconia fiber gradually increased with the increase of temperature. We supposed that the increase of microwave absorbency is related to the ionic (oxygen) conduction behavior of stabilized zirconia. Stoichiometric composition ZrO2 powder was also subjected for a measurement to consider the relation between microwave absorbency and ion conduction of zirconia. As the result, stoichiometric composition ZrO2 powder was not absorbed microwave power even when the powder was heated up to 900oC because it isn’t an oxygen ion conductor.

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