Densification Dynamics of WC–36 wt.% Cu Cermet During Impact Assisted Sintering in Vacuum

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS Powder Metallurgy and Metal Ceramics Pub Date : 2023-08-14 DOI:10.1007/s11106-023-00353-w
M. S. Kovalchenko, A. V. Laptiev, O. I. Tolochyn
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Abstract

The densification of a fine-grained tungsten carbide cermet containing 36 wt.% copper binder during impact assisted sintering in a vacuum at thermodynamic temperatures of 1023, 1123, and 1223 K with an initial impact velocity of 6.4 m/s was studied. Based on the experimental data and calculated elastic properties of the samples and the impact machine, computational modeling of the densification dynamics with a trial and error method was carried out using a third-order dynamic system in combination with the rheological model of Maxwell’s viscoelastic body, and as a result previously unknown values of shear viscosity for material cermet matrices were obtained. The time dependences of force, compression, velocity, and acceleration of the system, as well as shrinkage, root-mean-square stress, and strain rate, of the cermet samples during impact assisted sintering were determined. The calculated phase trajectory of the dynamic system movement showed that the initial kinetic energy of the impact was not completely exhausted for the irreversible densification of the cermet samples. Part of the energy dissipated in the environment after the rebound of the machine’s impact parts. At the initial stage, the system exhibited nonperiodic (atemporal) damping during its movement at high ratios between the system’s stiffness and the cermet samples’ viscous resistance. As the ratio decreased, the movement transformed into damping oscillations. The work of densification and the thermomechanical effect, which significantly increased the temperature of porous samples, were evaluated. The estimated activation energy of the viscous flow for the porous cermet matrix was 0.34 eV or 33 kJ/mol that indicated the dislocation mechanism of sintering. The samples produced by impact assisted sintering showed significantly higher strength values compared to pressureless sintered samples at a higher temperature.

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wc - 36wt .% Cu陶瓷真空冲击辅助烧结致密化动力学研究
研究了在1023,1123和1223k的热力学温度和6.4 m/s的初始冲击速度下,含36wt .%铜结合剂的细晶碳化钨陶瓷在真空冲击辅助烧结过程中的致密化过程。基于实验数据和计算得到的试样和冲击机的弹性特性,结合Maxwell粘弹性体流变模型,采用试错法对三阶动力学系统进行了致密化动力学计算建模,得到了金属陶瓷基体剪切粘度的未知值。测定了冲击辅助烧结过程中金属陶瓷样品的力、压缩、速度和加速度以及收缩率、均方根应力和应变率与时间的关系。计算得到的动力学体系运动相轨迹表明,冲击的初始动能并未完全耗尽,导致陶瓷试样的不可逆致密化。部分能量在环境中耗散后反弹到机器的冲击部件上。在初始阶段,系统在其运动过程中表现出非周期性(非时序)阻尼,系统刚度与金属陶瓷样品粘性阻力之间的比例很高。随着比的减小,运动转变为阻尼振荡。对致密化的功和显著提高多孔样品温度的热力学效应进行了评价。多孔陶瓷基体黏性流动的活化能估计为0.34 eV或33 kJ/mol,表明了烧结的位错机制。与无压烧结试样相比,冲击辅助烧结试样在较高温度下的强度值显著提高。
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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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