Fabrication of diamond whiskers by powder injection molding

Wu, Qing; Luo, Zhen; Deng, Zhaohui; Wang, Yu; Fu, Zhaohui

doi:10.1016/j.ijrmhm.2018.03.009

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…It seems that the addition of Ce can effectively improve the wettability of the Cu-based alloy powder, the capillary force pulls the molten alloy up the slope of the diamonds and forms a hill-like structure around diamonds. Such a massive support of brazing alloy can obviously enhance the bonding strength [18]. It is clearly seen in Figure 8b that adding a small amount of rare earth Ce can remarkably increase the climbing height of the Cu-based alloy.…”

Section: Climbing Height Of the Cu-based Alloymentioning

confidence: 95%

Effects of Rare Earth Ce on the Brazing Performance of High Energy Mechanical Milling Cu-Based Alloy Powder

Luo

Wang

et al. 2018

Metals

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CuSn and TiH 2 powders were milled by high energy mechanical milling to prepare Cu-based alloy powder for brazing diamond, and a small amount of rare earth Ce was added to improve the brazing performance. The effects of Ce on the brazing performance were studied by investigating transverse rupture strength, microstructure of brazing layer, climbing height along the diamond, and wear characteristics of the diamonds. The results indicated that the addition of Ce could effectively improve the transverse rupture strength, the transverse rupture strength reached the maximum value 475 MPa when the Ce content was 0.75 wt %. Rare earth Ce could promote the refinement of Cu 6 Sn 5 and CuTi 2 grains in the brazing alloy, which effectively reduced the formation and propagation of cracks. The wettability of the Cu-based alloy was also improved by adding rare earth Ce, and the capillary force pulled the molten alloy up the diamonds and formed a hill-like structure around diamonds. The diamonds brazed with Cu-based alloy containing 0.75 wt % Ce mainly led to integrity, micro-fracture, fracture and rubdown during the grinding process; pull-out of diamonds did not happen easily owing to the presence of strong adhesion between the diamonds and Cu-based alloy.

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Section: Climbing Height Of the Cu-based Alloymentioning

confidence: 95%

Effects of Rare Earth Ce on the Brazing Performance of High Energy Mechanical Milling Cu-Based Alloy Powder

Luo

Wang

et al. 2018

Metals

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“…If O 4 2 is maximized, the kurtosis of y n can be guaranteed to be the largest. At this time, the derivative of O 4 2 with respect to ⃗ f is 0, that is:…”

Section: Formula Derivationmentioning

confidence: 99%

“…Molding is one of the main manufacturing methods, of which injection molding and die casting are the most widely used. Injection molding [1][2][3][4][5] is the main molding method of * Author to whom any correspondence should be addressed. thermoplastics, and the injection mold is the technological equipment of plastic products, representing the advancement of polymer application technology.…”

Section: Introductionmentioning

confidence: 99%

Non-intrusive ultrasonic measurement of tie-bar stress for molding equipment

Zhuo¹,

Ji²,

Xie³

et al. 2022

Meas. Sci. Technol.

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For molding equipment, the accurate measurement of tie-bar stress helps improve product quality and prolong the lifespan of the machine. In our previous work, the mathematical model between the ultrasonic time difference (UTD) and the tie-bar stress was established, and this model was shown to have high accuracy with the maximum of difference square being only 1.5678 (MPa)2. Nevertheless, when calculating the ultrasonic time difference using the cross-correlation function (CCF) method, it is necessary to manually divide the position of the echoes. This makes it impossible to automate the stress measurement and it is incompetent when dealing with massive data. In this paper, a non-intrusive (N-I) ultrasonic measurement method for tie-bar stress based on the minimum entropy blind deconvolution is firstly proposed. The results of simulation and verification experiments show that the proposed method has high precision, and the maximum relative error is only 2.4392%. Hence this method has been successfully applied in the tie-bar stress measurement in molding equipment. Compared with the CCF method, the accuracy is improved and the maximum relative error is reduced from 3.67% to 1.68% when the clamping force is small. In summary, the proposed method is comparable to the CCF method in accuracy, and has a higher resolution during echos disturbance. Moreover, this approach does not require human intervention and is helpful to realize the automation of the tie-bar stress measurement for the molding equipment.

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