Microstructure and mechanical properties of TiB2–B4C ceramics fabricated by hot-pressing

The enhancement in the comprehensive performance of hardness, toughness, and strength is significant for ceramic materials. In this study, the B4C–TiB2 multilayer graded ceramics were designed and integrally manufactured by spark plasma sintering method using B4C and TiB2 as raw materials. The B4C–TiB2 multilayer graded ceramics feature a transition from the top layer with high hardness to the bottom layer with high toughness, passing through an intermediate layer. The gradient change of this material is observed in both the hardness and fracture toughness, reaching values of 36.2–28.4 GPa and 2.2–6.2 MPa m.5. The compressive strength reaches up to 2960 MPa, whereas the bending strength gets to 677 MPa in the appropriate loading direction. The structure forms a gradient pattern with high hardness on the front side, high toughness on the back side, and overall low density and high strength. This study may facilitate the development of impact‐resistant performance of lightweight materials.

Section: Introductionmentioning

confidence: 99%

Integrated preparation of B₄C–TiB₂ multilayer graded ceramics with high hardness and high toughness

Tan,

Zou,

Wang

et al. 2024

“…[1][2][3][4][5][6][7] These characteristics enable their extensive applications in hightemperature wear-resistant components, crucibles, electrolytic electrodes, armor protection, and cutting tools. [8][9][10][11] Owing to TiB 2 's high melting point and low self-diffusion coefficient, achieving sintering densification in purephase TiB 2 ceramics is challenging, necessitating elevated sintering temperatures. Nevertheless, the elevated sintering temperature tends to induce abnormal growth in TiB 2 grains, resulting in the formation of microcracks that compromise its performance.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and thermal shock resistance of TiB₂‒B₄C composite ceramic tool materials at microscopic scale

Wang,

Ding,

Zhang

et al. 2024

A finite model incorporating microstructure was developed to investigate the thermal shock resistance of TiB2‒B4C composite ceramic cutting tool materials. Numerical simulations were conducted to analyze changes in the transient temperature field and thermal stress field during the thermal shock process. TiB2‒B4C composite ceramic tool materials were fabricated using discharge plasma sintering technology. With different B4C contents, different sintering temperatures and holding times as study variables, optimization of the sintering process parameters and ceramic material components was achieved through testing the mechanical and microscopic morphology of the ceramics. Thermal shock water quenching experiments were performed, and the strength‐decay method was employed to assess the thermal shock resistance of TiB2‒B4C ceramics. The findings indicate that the optimal sintering conditions are temperature of 1700°C and holding time of 5 min. The TiB2‒B4C ceramic material containing 20 vol% B4C exhibits superior comprehensive mechanical properties and thermal shock resistance, and its relative density, fracture toughness, hardness, and flexural strength were 99.3%, 6.8 MPa m1/2, 22.8 GPa, and 598 MPa, respectively. The critical thermal shock temperature difference falls within the range of 400°C‒500°C.

“…Although the fracture toughness and impact resistance of single-phase B 4 C ceramics are poor, these defects of B 4 C ceramics can be alleviated by introducing a toughening phase, such as boride, carbide, or oxide. [12][13][14][15] Titanium boride (TiB 2 ) is an applicable toughening phase for B 4 C ceramics, and the addition of TiB 2 to B 4 C ceramics can effectively improve the fracture toughness of B 4 C ceramics without sacrificing the hardness. [13][14][15][16] Therefore, the B 4 C-TiB 2 composite ceramic is a potential candidate tool for cutting superhard materials.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15] Titanium boride (TiB 2 ) is an applicable toughening phase for B 4 C ceramics, and the addition of TiB 2 to B 4 C ceramics can effectively improve the fracture toughness of B 4 C ceramics without sacrificing the hardness. [13][14][15][16] Therefore, the B 4 C-TiB 2 composite ceramic is a potential candidate tool for cutting superhard materials. However, the study and application of B 4 C-TiB 2 composites as cutting tools are rare.…”

Section: Introductionmentioning

confidence: 99%

“…Boron carbide (B 4 C) is the third hardest material at room temperature and becomes the hardest material at temperatures above 1200°C 9–12 ; hence, it can satisfy the hardness requirement for super‐hard cutting tool materials. Although the fracture toughness and impact resistance of single‐phase B 4 C ceramics are poor, these defects of B 4 C ceramics can be alleviated by introducing a toughening phase, such as boride, carbide, or oxide 12–15 . Titanium boride (TiB 2 ) is an applicable toughening phase for B 4 C ceramics, and the addition of TiB 2 to B 4 C ceramics can effectively improve the fracture toughness of B 4 C ceramics without sacrificing the hardness 13–16 .…”

Section: Introductionmentioning

confidence: 99%

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Finite element simulation and experimental analysis of B₄C‐TiB₂‐SiC ceramic cutting tools

Yang

Zhang

et al. 2023

Here, cutting properties and wear mechanism of the home‐made B4C‐TiB2‐SiC ceramic cutting tools in turning of AISI 4340 steel workpieces were studied through a combination of finite element simulation using Deform‐3D software and turning experiments. Simulation results show that cutting parameters have significant effects on the main cutting force and tool temperature of the B4C‐TiB2‐SiC cutting tool. The optimal cutting parameters for the ceramic cutting tool are cutting speed of 300 m/min, depth of cut of .3 mm, and feed rate of .1 mm/r. Experimental results show the cutting length of the B4C‐TiB2‐SiC cutting tool is about 101 m, which is 21.0% and 32.9% larger than that of the home‐made B4C‐TiB2 ceramic cutting tool and commercially available tungsten carbide tool, indicating that the B4C‐TiB2‐SiC cutting tool has a desired service life. The surface roughness of the workpieces processed by the B4C‐TiB2‐SiC cutting tool is 2.43 µm, which is 29.4% lower than that of the workpieces processed by the B4C‐TiB2 cutting tool, indicating that the B4C‐TiB2‐SiC cutting tool has a satisfying machining accuracy. Wear forms of the B4C‐TiB2‐SiC ceramic cutting tool involve craters, chipping, and flank wear, and the main wear mechanisms are abrasive, adhesive, oxidative, and diffusion wear.