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Evaluation of Mechanical and Tribological Characteristics of ZrB2-Based Ultra-High-Temperature Ceramics (UHTC)
https://orcid.org/http://orcid.org/0000-0002-3053-8501
Materials that are robust at high temperatures and in reactive environments are known as ultra-high-temperature ceramic composites (UHTC). The group of IV and V materials is commonly used to make UHTC because of their higher thermal conductivity and melting point. The development of UHTC and tribological characterization of the developed sample are the primary goals of the current effort in order to increase wear resistance. The current study used three powder components to make zirconium diboride (ZrB2)-based UHTC: B4C (35%), ZrB2 (55%), and Cr (10%), with particle sizes of 30 m, 15 m, and 4 m, respectively. They are created by grinding zirconium balls for 0–48 h at 500 revolutions per minute. Additionally, the powder mixture and green binder were retained in a compaction machine mould weighing 20 g of milled powder mixed with 5 ml of polyvinyl alcohol. A sample of compacted composites was created using a compaction machine with a 12-mm cylinder diameter, an 8-ton pressure, and a 150-s holding period. The sample was sintered at 1600 °C and 1700 °C at 20 bars for 4 h while being surrounded by argon gas. Additionally, dried, out-compacted composite pallets are sintered using the spark plasma sintering process (SPS) at 1900 °C when an inert gas (argon) is present, with a withholding time of 2 min. The ball-on-disc wear testing machine was used to investigate the wear characteristics of a newly created ultra-high-temperature ceramic composite. The conventionally sintered composites at 1600 °C and 1700 °C had deeper penetration ranging from 550 to 1300 microns, compared to the sparks plasma sintered composite at 1900 °C, which has a deeper penetration ranging from 70 to 75 microns. The mechanical properties of composites are investigated, and the results show that sparks plasma sintered composites at 1900 °C have the highest flexural strength (336.3 MPa), fracture toughness (7.32 MPa.m1/2), and modulus of elasticity (249 GPa). Additionally, the effect of porosity on flexural strength and hardness is also studied. The SEM is utilized to evaluate the bonds and porous microstructure of the UHTC in more detail.
Evaluation of Mechanical and Tribological Characteristics of ZrB2-Based Ultra-High-Temperature Ceramics (UHTC)
https://orcid.org/http://orcid.org/0000-0002-3053-8501
Materials that are robust at high temperatures and in reactive environments are known as ultra-high-temperature ceramic composites (UHTC). The group of IV and V materials is commonly used to make UHTC because of their higher thermal conductivity and melting point. The development of UHTC and tribological characterization of the developed sample are the primary goals of the current effort in order to increase wear resistance. The current study used three powder components to make zirconium diboride (ZrB2)-based UHTC: B4C (35%), ZrB2 (55%), and Cr (10%), with particle sizes of 30 m, 15 m, and 4 m, respectively. They are created by grinding zirconium balls for 0–48 h at 500 revolutions per minute. Additionally, the powder mixture and green binder were retained in a compaction machine mould weighing 20 g of milled powder mixed with 5 ml of polyvinyl alcohol. A sample of compacted composites was created using a compaction machine with a 12-mm cylinder diameter, an 8-ton pressure, and a 150-s holding period. The sample was sintered at 1600 °C and 1700 °C at 20 bars for 4 h while being surrounded by argon gas. Additionally, dried, out-compacted composite pallets are sintered using the spark plasma sintering process (SPS) at 1900 °C when an inert gas (argon) is present, with a withholding time of 2 min. The ball-on-disc wear testing machine was used to investigate the wear characteristics of a newly created ultra-high-temperature ceramic composite. The conventionally sintered composites at 1600 °C and 1700 °C had deeper penetration ranging from 550 to 1300 microns, compared to the sparks plasma sintered composite at 1900 °C, which has a deeper penetration ranging from 70 to 75 microns. The mechanical properties of composites are investigated, and the results show that sparks plasma sintered composites at 1900 °C have the highest flexural strength (336.3 MPa), fracture toughness (7.32 MPa.m1/2), and modulus of elasticity (249 GPa). Additionally, the effect of porosity on flexural strength and hardness is also studied. The SEM is utilized to evaluate the bonds and porous microstructure of the UHTC in more detail.
Evaluation of Mechanical and Tribological Characteristics of ZrB2-Based Ultra-High-Temperature Ceramics (UHTC)
https://orcid.org/http://orcid.org/0000-0002-3053-8501
Materials that are robust at high temperatures and in reactive environments are known as ultra-high-temperature ceramic composites (UHTC). The group of IV and V materials is commonly used to make UHTC because of their higher thermal conductivity and melting point. The development of UHTC and tribological characterization of the developed sample are the primary goals of the current effort in order to increase wear resistance. The current study used three powder components to make zirconium diboride (ZrB2)-based UHTC: B4C (35%), ZrB2 (55%), and Cr (10%), with particle sizes of 30 m, 15 m, and 4 m, respectively. They are created by grinding zirconium balls for 0–48 h at 500 revolutions per minute. Additionally, the powder mixture and green binder were retained in a compaction machine mould weighing 20 g of milled powder mixed with 5 ml of polyvinyl alcohol. A sample of compacted composites was created using a compaction machine with a 12-mm cylinder diameter, an 8-ton pressure, and a 150-s holding period. The sample was sintered at 1600 °C and 1700 °C at 20 bars for 4 h while being surrounded by argon gas. Additionally, dried, out-compacted composite pallets are sintered using the spark plasma sintering process (SPS) at 1900 °C when an inert gas (argon) is present, with a withholding time of 2 min. The ball-on-disc wear testing machine was used to investigate the wear characteristics of a newly created ultra-high-temperature ceramic composite. The conventionally sintered composites at 1600 °C and 1700 °C had deeper penetration ranging from 550 to 1300 microns, compared to the sparks plasma sintered composite at 1900 °C, which has a deeper penetration ranging from 70 to 75 microns. The mechanical properties of composites are investigated, and the results show that sparks plasma sintered composites at 1900 °C have the highest flexural strength (336.3 MPa), fracture toughness (7.32 MPa.m1/2), and modulus of elasticity (249 GPa). Additionally, the effect of porosity on flexural strength and hardness is also studied. The SEM is utilized to evaluate the bonds and porous microstructure of the UHTC in more detail.
Evaluation of Mechanical and Tribological Characteristics of ZrB2-Based Ultra-High-Temperature Ceramics (UHTC)
J. Inst. Eng. India Ser. D
Kumar, Sandeep (author) / Singh, Abhishek (author)
Journal of The Institution of Engineers (India): Series D ; 105 ; 1601-1607
2024-12-01
7 pages
Article (Journal)
Electronic Resource
English
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