synthesis of zrb2 powder
ZrB2 powders have been industrially produced by the reaction of zirconium oxide (ZrO2), boron carbide (B4C), and carbon (C) as ZrO2 + 1/2B4C + 3/2C → ZrB2 + 2CO . In these reactions, high temperatures (>1873 K) are required and grain growth in the ZrB2 powder is inevitable.
ZrB2 powders were synthesized at temperatures ≥873 K from mixtures of ZrO2, B2O3, and Na.
•The particle sizes of the obtained powders were increasing with increasing synthesis temperature.
•ZrB2 fine powder (<0.1 μm in size) was synthesized at temperatures as low as 873 K.
ZrB2 was synthesized by heating a mixture of ZrO2, B2O3, and Na in a molar ratio of 1:1:5 at 873–1273 K.
While unreacted ZrO2 remained in the sample synthesized at 873 K, single-phase ZrB2 powders were obtained at temperatures ≥1073 K.
The diameters of the ZrB2 particles obtained at 1073 and 1273 K were 0.1–20 and 10–100 μm, respectively.
Single-phase ZrB2 was also obtained at 873 K when the starting material was rich in B2O3 and Na (ZrO2:B2O3:Na = 1:5:15).
This route yielded fine particle aggregates of ZrB2, which were found to be <0.1 μm in size.
ZrB2 is an ultra-high-temperature ceramic (UHTC) with a unique set of properties, ... It is possible to synthesize ZrB2 directly from Zr and B powders using a self.
ZrB2 and ZrB2-SiC powders are synthesized by a sol-gel method from zirconium n-propoxide, tetraethyl orthosilicate (only for ZrB2-SiC), boric acid, and sucrose.
After reduction at 1550 degrees C, both ZrB2 and ZrB2-SiC are unconsolidated, soft gray powders.
The ZrB2-SiC particles have an equiaxed shape with a diameter of about 800 nm and uniform size distribution.
The SiC may be very finely distributed, because we barely find SiC among ZrB2 particles when using energy-dispersive X-ray spectroscopy (EDS), although both ZrB2 and SiC are identified by X-ray diffractometry (XRD).
ZrB2 powder was successfully synthesized using the as-prepared amorphous hydrous nano-ZrO2 via borothermal and carbothermal
Zirconium diboride (ZrB2) powders were synthesized using ZrO2 + B2O3 + C (carbothermal reduction), ZrO2 + B 4C (boron carbide reduction), and ZrO2 + B 4C + C (combined reduction) with various compositions at 1250 °C for 1-3 h under flowing argon.
ZrB2 powders synthesized using ZrO2 + B2O3 + C displayed rod shape growth.
There was much residual impurity carbon in ZrB 2 powders synthesized using ZrO2 + B4C + C.
When synthesized using ZrO2 + B4C, there were the residual impurity B2O3 and little rod shape growth.
Residual B2O3 impurities were easily removed by washing with methanol.
We concluded that the ZrB2 powder synthesis method using boron carbide reduction is the most desirable way to produce ZrB 2 powders among the three synthesis routes.
ZrB2 powders synthesized using ZrO2 + B4C have a particle size of 1.1 μm and a hexagonal shape, and low oxygen content (0.725 wt.%).
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