Advanced Materials Research Vols. 490-495

Abstract: By intelligent use the casting head and chilling, select the appropriate chemical composition and cast, execute the technical procedure in strict rotation, promptly resolve production problems for production of qualified cast ductile iron.

Abstract: The basic unit of bamboo flooring-bamboo piece was used for the dyeing experiments, and the influence was discussed for dyeing technology to dye-uptake of piece, in order to meet market great demand for color diversity of bamboo flooring.The results showed: dye concentration had a major impact on the dye-uptake, appropriate concentration was 1%; dyeing temperature had a greater impact on the dye-uptake, appropriate temperature was 90°C; dyeing time had a greater impact on the dye-uptake, with the dyeing time lengthen, dye-uptake increases; pH value of dye solution had a significant effect on the dye-uptake, the appropriate pH value was 4.5.

Abstract: New complex inorganic ion exchanger Al1.25Fe0.75(PO4)2 is synthesized. Chemical composition, structure and some related properties and complex mechanism of this ion exchanger are investigated by electron microscopic, X-ray diffraction and chemical methods. The ion exchange behavior of Al1.25Fe0.75(PO4)2 has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li+ in 0.1mol /L HNO3 solution is 7.0mmol/g.

Abstract: In order to research impacting strength of bamboo-plastic composite from bamboo powder content, particle size, type of coupling agent, etc. The bamboo-plastic composite is made of extrusion and injection molding process. Results show: when bamboo powder content is 30%, impacting strength of the material is the highest; the bamboo-plastic composite which made of Silane and MAPE has higher impacting strength than others; when PP: HDPE = 2:3, the impacting strength of the bamboo-plastic composite is the highest. Compared with these factors, the coupling agent on impacting strength is the most obvious influence.

Abstract: The technology to simulate the semiconductor production line, consider main factors that will impact the production, and get the output from the simulation system as the reference for production scheduling is presented in this paper. By initiating the simulation model, include the die delivery information, equipment occupation information and etc. base on the FIFO (first in first out) and other principles, simulated the discrete event with four categories and also for two basic actions. The prediction result aligned with the actual production by T test. Changing the scheduling schemes at the same initial state of product line, engineer could obtain the optimal scheduling scheme by the comparing different simulation results. This study is not only an efficient, visual scheduling method, but also it is the basis for product re-scheduling. And this technology has been deployed in one ATM (Assembly and Test Manufacturing factory) factory in Chengdu and gets positive feedback.

Abstract: The testing and evaluation of the retroreflective materials are the basic work of the road traffic engineering quality. In this paper, artificial neural networks are used to make the study on the photometric performance attenuation law of retroreflection materials. Through the establishment of photometric prediction models to forecast reflection coefficient of the different types of retroreflective sheeting, compared with the testing values, the results showed that photometric performance attenuation law can predict the coefficient of retroreflection of retroreflective sheeting. This conclusion is important for the application of retroreflective materials.

Abstract: The self-lubricating coating which is dense in microstructure with low porosity and degradation is sprayed by HVOF and the spray powder is Nickel coated MoS2 with 22%wt of MoS2. The mean bonding strength and hardness of Ni-MoS2 coating is respectively about 13.68 MPa and HRB94.5. Tribological performance is evaluated by the test of dry friction coefficient, which fluctuates from 0.25 to 0.32, while the wear granule is symmetry with a uniform distribution in size, moreover, the experiment results indicate the main wear failure mode of coating is abrasive wear.

Abstract: In cutting temperature survey, in order to reflect the temperature change of cutting area accurately, the cutting tool sensor should have good technical characteristic. In this paper, one kind of automatic calibration system has been developed which could be used to investigate the technical characteristic of the multi-layered laminated thin film thermocouple cutting temperature sensor, this system selects Platinum-chip temperature sensor (concrete model: EN60751) as the standard temperature sensor, uses the AD524 precise amplifier chip building amplifying circuit and compiles the software with LabVIEW. This paper intends to investigate the static characteristic of the multi-layered laminated thin film thermocouple cutting temperature sensor system, the result shows that the Seebeck coefficient is 66.9 μV/°C, and the nonlinear error of fitting is smaller than 0.32%. This research has paved the way for future studying of thin film thermocouple cutting temperature sensor technology characteristic.

Abstract: Mass segregation of Al2O3 slurries during centrifugal slip casing has important effect on microstructure and mechanical property of sintered Al2O3 ceramic, so the study on effect of centrifugal process parameters on mass segregation of slurries has significant meaning. Al2O3 ceramic slurries with different solid content varying from 30vol% to 50vol% were prepared. The effect of centrifugal time, centrifugal acceleration and solid content of slurries on green density uniformity of Al2O3 ceramic compacts was studied. The microstructure of centrifuged compacts was observed using scanning electron microscopy (SSX-505). The results show with the increase of centrifugal acceleration and solid content of slurries, the mass segregation of Al2O3 particles with different size increases and decreases, respectively. However, centrifugal time has no obvious effect on green density uniformity. SEM observation shows the green compacts have uniform microstructure when centrifuged at 2860g for 2h with 50vol% slurries.

Abstract: Gradient porous Ti was prepared by powder metallurgy method using NH4HCO3 as pore former. The effect of content and distribution of NH4HCO3 and sintering temperature on pore characteristic, sintering shrinkage, flexural property was studied. Stress-strain curves of gradient and uniform porous Ti material were compared. The results show the porosity, sintering shrinkage rate and flexural strength vary from 51.8% to 41.3%, from 23.5% to 28.7%, and from 145.7 MPa to 221.6 MPa when the distribution of NH4HCO3 varying form uniformity to gradient. Additionally, with the increase of sintering temperature, the porosity of gradient samples first increases and then decreases. When sintered at 1573K for 2h, the porosity of gradient porous Ti has the maximum of 45.6%. Moreover, there is pseudo yield phenomenon according to the test curve of three points bending of the gradient porous Ti with three layers structure.