Search1996 Vol. 3, No. 1
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1996, vol. 3, no. 1, pp.
1-7.
Abstract:
Complex ZrO2-Y2O3 sol were prepared from precursors of inorganic salts and metal alkoxides. The processes for complex ZrO2-Y2O3 sol preparation and purification, the sol-gel transformation and the characterization of the sol from the two kinds of precursors were discussed and compared. It was found that the colloidal particles were amorphous in nature, and extremely fine (<10nm) in the both cases. ZrO2-Y2O3 coatings on GH220 superalloy samples MCrAlX (M=Fe, Co, Ni, X=Y, Ta,Hf…) pre-coated) were prepared using sols from the two different processes and tested at 1000 ℃ for 100 h in laboratory air. Results showed that only the coatings from the metal alkoxides derived sol offered excellent oxidation resistance.
Complex ZrO2-Y2O3 sol were prepared from precursors of inorganic salts and metal alkoxides. The processes for complex ZrO2-Y2O3 sol preparation and purification, the sol-gel transformation and the characterization of the sol from the two kinds of precursors were discussed and compared. It was found that the colloidal particles were amorphous in nature, and extremely fine (<10nm) in the both cases. ZrO2-Y2O3 coatings on GH220 superalloy samples MCrAlX (M=Fe, Co, Ni, X=Y, Ta,Hf…) pre-coated) were prepared using sols from the two different processes and tested at 1000 ℃ for 100 h in laboratory air. Results showed that only the coatings from the metal alkoxides derived sol offered excellent oxidation resistance.
1996, vol. 3, no. 1, pp.
8-11.
Abstract:
MnS growth in sintered steels with admixed Fe, Cu, C and MnS has been investigated by SEM and X-ray diffraction, MnS in Fe-Cu-C-MnS sintered steels in which MnS has been admixed is not stable and MnS growth may be ascribed to sintering between MnS particles or reaction between MnS and Fe, Cu, C elements.
MnS growth in sintered steels with admixed Fe, Cu, C and MnS has been investigated by SEM and X-ray diffraction, MnS in Fe-Cu-C-MnS sintered steels in which MnS has been admixed is not stable and MnS growth may be ascribed to sintering between MnS particles or reaction between MnS and Fe, Cu, C elements.
1996, vol. 3, no. 1, pp.
12-16.
Abstract:
Effect of direct current negative bias on diamond nucleation in microwave plasma assisted chemical vapor deposition system was discussed. The influence of the magnitude of negative bias value,bias duration and methane concentration in the gas mixture on nucleation density of diamond films was studied respectively. It is demonstrated that direct current negative bias can drastically enhance the diamond nucleation at a suitable value.Long bias duration and high methane concentration are helpful for diamond nucleation.
Effect of direct current negative bias on diamond nucleation in microwave plasma assisted chemical vapor deposition system was discussed. The influence of the magnitude of negative bias value,bias duration and methane concentration in the gas mixture on nucleation density of diamond films was studied respectively. It is demonstrated that direct current negative bias can drastically enhance the diamond nucleation at a suitable value.Long bias duration and high methane concentration are helpful for diamond nucleation.
1996, vol. 3, no. 1, pp.
17-20,54.
Abstract:
By a non-transformed arc plasma torch whose gas is nitrogen,scrap of high-carbon ferrochrome was heated and melted in a sealed furnace. When the liquid bath was at 1600℃,top blowing of oxygen began to decrease the bath's carbon without stopping plasma operation for its temperature addition and maintennace of at least 1750 ℃. The liquid bath was agitated by bottom-blowning nitrogen. In the experiments low carbon Fe-Cr have been obtained whose composition respectively was 0.45% carbon,50.75% chrome and 0.42% carbon, 70.25% chrome. Loss of chrome could be less than 5%.
By a non-transformed arc plasma torch whose gas is nitrogen,scrap of high-carbon ferrochrome was heated and melted in a sealed furnace. When the liquid bath was at 1600℃,top blowing of oxygen began to decrease the bath's carbon without stopping plasma operation for its temperature addition and maintennace of at least 1750 ℃. The liquid bath was agitated by bottom-blowning nitrogen. In the experiments low carbon Fe-Cr have been obtained whose composition respectively was 0.45% carbon,50.75% chrome and 0.42% carbon, 70.25% chrome. Loss of chrome could be less than 5%.
1996, vol. 3, no. 1, pp.
21-25.
Abstract:
In this paper, through the data treatment of correlation coefficients and the clustering technique of pattern recognition, both the matrix of correlation coefficients and the pedigree of factor clusters show that some factors affecting soil corrosivity are interrelated closely, and some independent relatively. The data analytical method used in this paper has certain assistance to the selection of major soil factors during the prediction and evaluation of soil corrosivity.
In this paper, through the data treatment of correlation coefficients and the clustering technique of pattern recognition, both the matrix of correlation coefficients and the pedigree of factor clusters show that some factors affecting soil corrosivity are interrelated closely, and some independent relatively. The data analytical method used in this paper has certain assistance to the selection of major soil factors during the prediction and evaluation of soil corrosivity.
1996, vol. 3, no. 1, pp.
26-30.
Abstract:
A technique for wear particle identification using computer vision system is described. The computer vision system employs LVQ Neural Networks as classifier to recognize the surface texture of wear particles in lubricating oil and determine the conditions of machines. The recognition process includes four stages:(1) capturing image from ferrographies containing wear particles;(2) digitising the image and extracting features;(3) learning the training data selected from the feature data set;(4) identifying the wear particles and generating the result report of machine condition classification. To verify the technique proposed here, the recognition results of several typical classes of wear particles generated at the sliding and rolling surfaces in a diesel engine are presented.
A technique for wear particle identification using computer vision system is described. The computer vision system employs LVQ Neural Networks as classifier to recognize the surface texture of wear particles in lubricating oil and determine the conditions of machines. The recognition process includes four stages:(1) capturing image from ferrographies containing wear particles;(2) digitising the image and extracting features;(3) learning the training data selected from the feature data set;(4) identifying the wear particles and generating the result report of machine condition classification. To verify the technique proposed here, the recognition results of several typical classes of wear particles generated at the sliding and rolling surfaces in a diesel engine are presented.
1996, vol. 3, no. 1, pp.
31-35.
Abstract:
The constructing method of a simulation system is discussed in this paper. It is for a Decision Support System (DSS) of main in-process warehouse on a large scale flexible production line. This system is decomposed into three function blocks: DSS, support environment for simulation, simulating dispatch module. It has a fine structure and works coordinatively to complete whatever assignment for simulation tasks of a complicated production system.
The constructing method of a simulation system is discussed in this paper. It is for a Decision Support System (DSS) of main in-process warehouse on a large scale flexible production line. This system is decomposed into three function blocks: DSS, support environment for simulation, simulating dispatch module. It has a fine structure and works coordinatively to complete whatever assignment for simulation tasks of a complicated production system.
1996, vol. 3, no. 1, pp.
36-42.
Abstract:
The pass design formulae and method of calculation according to the characters of 3-roll stands pass are presented.
The pass design formulae and method of calculation according to the characters of 3-roll stands pass are presented.
1996, vol. 3, no. 1, pp.
43-47.
Abstract:
Compared with BP network, ART network is characterized by self-organization, adaptation and fast run speed. So it is suitable for fault diagnosis tasks in manufacturing process. Structure and mechanism of ART network are introduced in this paper, and an intelligent tool condition monitoring system based on ART network is designed, and the successful detection of micro-diameter drill state in drilling has been carried out.
Compared with BP network, ART network is characterized by self-organization, adaptation and fast run speed. So it is suitable for fault diagnosis tasks in manufacturing process. Structure and mechanism of ART network are introduced in this paper, and an intelligent tool condition monitoring system based on ART network is designed, and the successful detection of micro-diameter drill state in drilling has been carried out.
1996, vol. 3, no. 1, pp.
48-54.
Abstract:
The oil film thickness of the distribution pair of the bent-axis pump is tested dynamically in this paper. On the basis of synthetical consideration of the leakage flow rate, the loss of power and the ability to resist contaminant of the distribution pair,the parameters used to describe the distribution state are optimized. According to theoretical analyses and experimental research, the structure of the distribution plate is improved, and the ability to resist contaminant wear of the distribution pair is increased. Thus, it is possible to prolong the service life and working reliability of the pump.
The oil film thickness of the distribution pair of the bent-axis pump is tested dynamically in this paper. On the basis of synthetical consideration of the leakage flow rate, the loss of power and the ability to resist contaminant of the distribution pair,the parameters used to describe the distribution state are optimized. According to theoretical analyses and experimental research, the structure of the distribution plate is improved, and the ability to resist contaminant wear of the distribution pair is increased. Thus, it is possible to prolong the service life and working reliability of the pump.
1996, vol. 3, no. 1, pp.
55-57.
Abstract:
The condition characteristics of hydraulic systems reflect running condition for the hydraulic equipment directly. It is the key for condition monitoring and early fault diagnosis to select characteristics reasonably. In this paper, the types, properties of characteristics in hydraulic equipment are analysed, and some considerations in their selection are presented.
The condition characteristics of hydraulic systems reflect running condition for the hydraulic equipment directly. It is the key for condition monitoring and early fault diagnosis to select characteristics reasonably. In this paper, the types, properties of characteristics in hydraulic equipment are analysed, and some considerations in their selection are presented.
1996, vol. 3, no. 1, pp.
58-63.
Abstract:
The assumed presupposition of limit equilibrium theory is recounted. Based on this, the expressive formula of radius of the non-elastic zone and rock displacement of tunnel outline was given.
The assumed presupposition of limit equilibrium theory is recounted. Based on this, the expressive formula of radius of the non-elastic zone and rock displacement of tunnel outline was given.
1996, vol. 3, no. 1, pp.
64-68.
Abstract:
The core loss spectrum P(f) of magnetic alloy with constant permeability has been studied. It is found that P(f) has the fractal structure. The effect of the induced anisotropy energy Ku on the fractal dimension Df is discussed.
The core loss spectrum P(f) of magnetic alloy with constant permeability has been studied. It is found that P(f) has the fractal structure. The effect of the induced anisotropy energy Ku on the fractal dimension Df is discussed.
1996, vol. 3, no. 1, pp.
69-74.
Abstract:
In this paper,the vibration signals in the fatigue crack growth process in a chinese steel used in a mining machinery were analyzed by the frequency spectrum, the time series and grey system model,and the critical criterion for crack initiation was proposed.
In this paper,the vibration signals in the fatigue crack growth process in a chinese steel used in a mining machinery were analyzed by the frequency spectrum, the time series and grey system model,and the critical criterion for crack initiation was proposed.
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