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Rare-earth thermal diffusion technology is an emerging technology, which is based on the traditional surface engineering technology. The article briefly introduces appLications of rare-earth thermal diffusion technology in plastic injection mould cavity surface treatment and detailedly expatiates the basic processes and conditions about rare-earth thermal diffusion technology. Compared to the traditional...
The way in which surface changes are transduced into a variation of an electrical parameter (often electrical resistance) depends on the surface oxidation level, material morphology its semiconductor behaviour, etc. Therefore, if one wants to understand more about the way in which gas-surface interactions affect the gas sensing properties of material, complex phenomenological and spectroscopic investigations...
This paper introduces electroless plating Ni-Cr-P/Ni-P composite coating technologies and techniques on the Nd-Fe-B permanent magnet surface. It obtains the optimum Ni-Cr-P, Ni-P electroless plating process through orthogonal experiments. It has got a Ni-Cr-P/Ni-P composite coating successfully on the Nd-Fe-B matrix surface through rational processing plan. The coating surfaces are bright and have...
3Cr2W8V steel is first dealed with laser consolidation, then treated by QPQ salt-bath nitriding complex technology. The treated surface microstructure was analyzed by using JSM-6360LV type SEM. The hardness and wear-resistance were tested for both laser consolidation plus QPQ salt-bath nitriding complex technology and only QPQ salt-bath nitriding. The experimental results indicate that the 3Cr2W8V...
In terms of grain refinement mechanism induced by plastic deformation, NiTi shape memory alloy (SMA) was processed by means of surface mechanical attrition treatment (SMAT) in order to achieve surface nanocrystallization for surface hardening. The cross sectional microhardness of the SMAT treated NiTi SMAs was measured, in comparison with those of the residual stress relaxation and recrystallization...
This paper describes activities aiming to evaluate and compare the resistance to a prolonged corona and ozone exposure for a range of epoxy based compositions filled with micro- and nano-fillers of silica at different proportions. It has been earlier shown for this system that substitution of 5 wt% of micro-filler by nano-filler slightly improved mechanical properties, yielding an increase in Young's...
The quality of a CdZnTe-based X-ray detector is highly related to the interface between semiconductor and metal contact. One of the factors that increase leakage currents in CdZnTe based X-Ray detectors is the presence of a conductive surface layer. In this paper the result of the passivation of the CdZnTe surface by means of an aqueous etching solution of NH4F/H2O2 is studied by optical ellipsometry...
Summary form only given. Surface modification of materials using intense pulsed electron beams result in an improvement of several properties like wear, corrosion and oxidation resistance. Three different treatment modes can be distinguished: rapid melting and solidification, surface alloying of coatings into the bulk and surface-fusing of coatings to the bulk. All three versions of surface treatment...
ldquoDevelopment for advanced thermoelectric conversion systemsrdquo supported by the new energy and industrial technology development organization (NEDO) has been successfully completed as one of the Japanese national energy conservation projects. Three types of the cascaded thermoelectric modules operating up to 850 K in high electrode temperature and two types of Bi-Te thermoelectric modules operating...
The present work aims at studying the cooling performance of a thermoelectric device that integrated with integrated heat spreader (IHS) on a flip-chip plastic ball grid array (FC-PBGA) package. The new thermoelectric device herein is fabricated on the metal substrates by flip-chip assembly process. Thermal performance of the new package was comprehensive studied. The thermal resistances of IHS with/without...
High-energy plasma immersion ion implantation (PIII) in the range of 50 – 100 keV is an interesting alternative of surface modification technique to more commonly investigated beam processing of materials in such energies. A Stacked Blumlein (SB) technique was used to reach high voltage pulses of 30 to 100 kV, with much cheaper and electronically simpler configuration compared to a hard tube system...
DC resistance testing using standard commercial electrodes has been a simple, standard way adopted by many for their evaluation of dissipative materials. However, we have observed that this test is ineffective for the detection of ldquohot spotsrdquo arising from non-homogeneities in the micro-structures of some dissipative materials. We have employed a combination of tests using a direct sharp tip...
The real time monitoring and control of resistance spot welds is a problem of critical importance in automotive and many other manufacturing industries. However, till this date, there are no reliable, low-cost, non-destructive techniques for predicting the size and strength of the weld nuggets in real time. This paper investigates the usage of voltage, current, and force data for the above tasks....
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