Colloidal processing and sintering of WC-based ceramics with low Ni content as sintering aid

Garcia-Ayala, E.M.; Silvestroni, L.; Yus, Joaquín; Ferrari, B.; Pastor, J.Y.; Sánchez-Herencia, Antonio Javier

doi:10.1016/j.jeurceramsoc.2020.10.038

Cited by 12 publications

(9 citation statements)

References 41 publications

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“…These stresses may have contributed to the breakdown of (Ti 1/3 Zr 1/3 Hf 1/3 )B 2 agglomerates, resulting in smaller and more uniformly dispersed (Ti 1/3 Zr 1/3 Hf 1/3 )B 2 particles. Additionally, PEI imparted a positive charge to the surface of WC 42 ; this could have enhanced the dispersibility of (Ti 1/3 Zr 1/3 Hf 1/3 )B 2 particles and promoted the uniformity of the slurry.…”

Section: Resultsmentioning

confidence: 99%

Enhanced high‐temperature strength in textured (Ti_1/3Zr_1/3Hf_1/3)B₂ medium‐entropy ceramics via strong magnetic field

Wang

Yuan³

et al. 2023

J Am Ceram Soc.

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This study prepared textured (Ti1/3Zr1/3Hf1/3)B2 medium‐entropy ceramics for the first time that maintain enhanced flexural strength up to 1800°C using single‐phase (Ti1/3Zr1/3Hf1/3)B2 powders, slip casting under a strong magnetic field, and hot‐pressed sintering methods. Effects of WC additive and strong magnetic field direction on the phase compositions, orientation degree, microstructure evolution, and high‐temperature flexural strength of (Ti1/3Zr1/3Hf1/3)B2 were investigated. (Ti1/3Zr1/3Hf1/3)B2 grain grows along the a,b‐axes, resulting in a platelet‐like morphology. Pressure parallel and perpendicular to the magnetic field direction can promote the orientation degree and hinder the texture structure formation, respectively. Reaction products of W(B,C) and (Ti,Zr,Hf)C between (Ti1/3Zr1/3Hf1/3)B2 and WC additive can efficiently refine the (Ti1/3Zr1/3Hf1/3)B2 grain size and promote grain orientation. (Ti1/3Zr1/3Hf1/3)B2 ceramics doped with 5 vol.% WC yielded a Lotgering orientation factor of 0.74 through slip casting under a strong magnetic field (12 T) and hot‐pressed sintering at 1900°C. Furthermore, cleaning the boundary by W(B,C) and introducing texture can enhance the grain‐boundary strength and improve its high‐temperature flexural strength. The four‐point flexural strength of textured (Ti1/3Zr1/3Hf1/3)B2‐5 vol.% WC ceramics was 770 ± 59 MPa at 1600°C and 638 ± 117 MPa at 1800°C.

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Section: Resultsmentioning

confidence: 99%

Enhanced high‐temperature strength in textured (Ti_1/3Zr_1/3Hf_1/3)B₂ medium‐entropy ceramics via strong magnetic field

Wang

Yuan³

et al. 2023

J Am Ceram Soc.

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“…It is shown that the WC-0Co has a higher VRR than the WC-12Co material under the same polishing conditions. Due to the binder, the tenacity of WC is enhanced, which possibly leads to the increase in the difficulty of material removal and the low removal rate [ 37 , 38 ]. It is notable that with the increase in dwell time the VRR of WC-0Co and WC-12Co materials is relatively stable, as shown in Figure 2 a.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Binder during Ultra-Precision Polishing of Tungsten Carbide Using a Semirigid Bonnet Tool

et al. 2022

Materials

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Tungsten carbide (WC) has the characteristics of high hardness, high strength, corrosion resistance, wear resistance and excellent fracture toughness. Accordingly, it has been commonly used as the material for cutting tools and molds in glass-forming techniques. To obtain ultra-smooth surfaces, fine polishing of WC is indispensable. However, the efficiency of WC polishing is low using the existing polishing methods, and the mechanism behind the polishing process requires further investigation. Specifically, the effect of the binder in WC polishing is not clear since there are different kinds of WC with various weight percentages of the binder. In this paper, we present the findings of a study on the polishing performance of two kinds of WC material, with and without the binder, using a semi-rigid (SR) bonnet polishing tool. A series of experiments were performed on a 6-DOF robotic polishing instrument to investigate the material-removal characteristics, surface integrity and sub-surface damage after polishing. The results demonstrate that the SR bonnet polishing tool successfully reduced the surface roughness of WC with and without the binder to the nanometric level, though the lowest surface roughness was obtained on binder-less WC. No obvious sub-surface damage was observed under SEM inspection, while the processing efficiency was greatly improved owing to the high material removal rate of the tool. Based on our analysis of key polishing parameters and corresponding surface integrities, the effect of the binder on the polishing performance is explained, which offers excellent guidance for WC polishing.

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“…Figure 1 shows scanning electron microscopy (SEM) images of the initial powders. Both WC and W5Ni powder mixtures were prepared using high solid content suspensions (30 vol%) using deionised water as a dispersion medium and polyethyleneimine (PEI Mw-2000, Sigma-Aldrich Química S.A., Madrid, Spain) as dispersant [26,28]. The powder mixtures of WC/10(W5Ni) and WC/20(W5Ni) were obtained by mixing the W5Ni and WC powders in the correct proportions as listed in Table 1.…”

Section: Starting Powders and Mixture Compositionsmentioning

confidence: 99%

“…The spark plasma sintering (SPS) method was employed to sinter the powders using a Dr. Sinter, SPS-510 CE (Fuji Electronic Industrial Co., Ltd., Shizuoka, Japan) with a 30 mm diameter die and graphite punches. The thermal cycles were adjusted to 1800 °C for Both WC and W5Ni powder mixtures were prepared using high solid content suspensions (30 vol%) using deionised water as a dispersion medium and polyethyleneimine (PEI Mw-2000, Sigma-Aldrich Química S.A., Madrid, Spain) as dispersant [26,28]. The powder mixtures of WC/10(W5Ni) and WC/20(W5Ni) were obtained by mixing the W5Ni and WC powders in the correct proportions as listed in Table 1.…”

Section: Spark Plasma Sintering (Sps)mentioning

confidence: 99%

Microstructural and Mechanical Characterization of Colloidal Processed WC/(W5Vol%Ni) via Spark Plasma Sintering

Zegai,

Besharatloo,

Ortega

et al. 2023

Materials

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This study investigates the sintering behaviour and properties of WC-based composites in which WC was mixed with W5vol%Ni in concentrations of 10vol% and 20vol%. Colloidal processing in water and spark plasma sintering were employed to disperse the WC particles and facilitate sintering. The addition of W5vol%Ni improved the sintering process, as evident from a lower onset temperature of shrinkage determined through dilatometric studies. All samples exhibited the formation of tungsten monocarbide (W2C), with a more pronounced presence in the WC/20(W5vol%Ni) composite. Sintering reached its maximum rate at 1550 °C and was completed at 1600 °C, resulting in a final density exceeding 99.8%. X-ray diffraction analysis confirmed the detection of WC and W2C phases after sintering. The observed WC content was higher than expected, which may be attributed to carbon diffusion during the process. Macro-scale mechanical characterisations revealed that the WC/10(W5vol%Ni) composite exhibited a hardness of 18.9 GPa, while the WC/20(W5vol%Ni) composite demonstrated a hardness of 18.3 GPa. Increasing the W5vol%Ni binder content caused a decrease in mechanical properties due to the formation of W2C phases. This study provides valuable insights into the sintering behavior and properties of WC/W5vol%Ni composites, offering potential applications in extreme environments.

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Colloidal processing and sintering of WC-based ceramics with low Ni content as sintering aid

Cited by 12 publications

References 41 publications

Enhanced high‐temperature strength in textured (Ti_1/3Zr_1/3Hf_1/3)B₂ medium‐entropy ceramics via strong magnetic field

Enhanced high‐temperature strength in textured (Ti_1/3Zr_1/3Hf_1/3)B₂ medium‐entropy ceramics via strong magnetic field

Effect of the Binder during Ultra-Precision Polishing of Tungsten Carbide Using a Semirigid Bonnet Tool

Microstructural and Mechanical Characterization of Colloidal Processed WC/(W5Vol%Ni) via Spark Plasma Sintering

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Colloidal processing and sintering of WC-based ceramics with low Ni content as sintering aid

Cited by 12 publications

References 41 publications

Enhanced high‐temperature strength in textured (Ti1/3Zr1/3Hf1/3)B2 medium‐entropy ceramics via strong magnetic field

Enhanced high‐temperature strength in textured (Ti1/3Zr1/3Hf1/3)B2 medium‐entropy ceramics via strong magnetic field

Effect of the Binder during Ultra-Precision Polishing of Tungsten Carbide Using a Semirigid Bonnet Tool

Microstructural and Mechanical Characterization of Colloidal Processed WC/(W5Vol%Ni) via Spark Plasma Sintering

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Product

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Enhanced high‐temperature strength in textured (Ti_1/3Zr_1/3Hf_1/3)B₂ medium‐entropy ceramics via strong magnetic field

Enhanced high‐temperature strength in textured (Ti_1/3Zr_1/3Hf_1/3)B₂ medium‐entropy ceramics via strong magnetic field