Abstract
The structures, processes of shrinkage, and phase composition of the compact system ZrO2-WC, obtained by hot pressing with the transmission of high current, are considered in the article. We found that as a result of compaction, the ZrO2-WC-ceramics have uniform density distribution, with the following optimal mode consolidation values T = 1,350°C, P = 30 MPa and t = 2 min. These conditions allow us to achieve the best combination of ceramic properties by criteria density and strength.
Highlights
Recently, most binary systems were made based on ZrO2 such as ZrO2-TiB2, ZrO2-TiCN, ZrO2-SiC, ZrO2TiN, and ZrO2-TiC
It is known that tungsten carbide is widely used in the manufacture of hard alloys based on WC-Co due to its high resistance to wear and low temperatures during use
A careful study using computerized color cathodoluminescence (CCL) attached to the scanning electron microscope (SEM) allowed for the determination of a significant amount of zirconia particles in the light phase (Figure 1a)
Summary
Most binary systems were made based on ZrO2 such as ZrO2-TiB2, ZrO2-TiCN, ZrO2-SiC, ZrO2TiN, and ZrO2-TiC. High mechanical properties of the material can be expected when ZrO2 is hardened by nanoparticles of the second phase (tungsten carbide). It will allow extensive use of obtained ceramics. It is known that tungsten carbide is widely used in the manufacture of hard alloys based on WC-Co due to its high resistance to wear and low temperatures during use. Attention was paid to determine the optimum ZrO2 in the composite materials based on WC made by high-energy FAST methods [1,2]. The authors in [3] reported that the addition of 30% micron-sized WC to ZrO2-matrix significantly increases the hardness and fracture toughness, but their values were low
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