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2018 Vol. 28, No. 01
Published: 2018-02-10
1
Progress in research and application of beryllium materials used in inertial guidance instrument
ZHONG Jing-ming，LI Zhi-nian，WANG Zhan-hong，WANG Dong-xin，LI Feng，LI Jun-yi，ZHANG Jian-kang
DOI: 10.13228/j.boyuan.issn1006-6543.20170132
The progress in research and application of high performance beryllium materials used in inertial guidance instrument at home and abroad were reviewed， and the new technical requirements， preparation methods and evaluation methods of beryllium material in China were introduced as well. Finally， the research and development of high performance beryllium material were prospected.
2018 Vol. 28 (01): 1-6 [
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Preparation and characterization of Co3O4 by wet precipitation-thermal decomposition with carbonate
WANG Wen-xiang，YAN Ying-yan，LI Hui-ying，LIU Ying，WANG Xiao-yang，LIU Zhi-hong
DOI: 10.13228/j.boyuan.issn1006-6543.20160097
The cobalt oxide precursor was prepared by wet precipitation method with cobalt chloride and ammonium bicarbonate as raw materials and Tween-80 as surfactant. The Co3O4 powder was obtained by thermal decomposition method. The morphology，crystal structure and thermal decomposition of precursor particles and Co3O4 powder were characterized by scanning electron microscope，laser particle size analyzer， X-ray diffractometer and thermal analyzer. Results show that the precursor of cobalt oxide prepared with carbonate as precipitant is Co2(OH)2CO3. The spherical cubic Co3O4 powder with uniform particle size distribution and without agglomeration is obtained when the precursor is calcined at 600 ℃ for 4 h. The average particle size of the Co3O4 powder is 4.48 μm and the mass percent of cobalt is 72.11%.
2018 Vol. 28 (01): 7-10 [
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Preparation of Co-Cr-V composite powder for spraying by thermal decomposition method
SHI Jian-ping，DING Hai-ping，ZHOU Xiao
DOI: 10.13228/j.boyuan.issn1006-6543.20170029
The Co-Cr-V composite powder for spraying was prepared by thermal decomposition method. The phase and element composition， average particle size and potential of the powder were measured. The relationship between the microstructure and pH value of the solution was also analyzed. The results show that both V and Cr atoms have entered the crystal lattice of Co metal matrix after thermal decomposition， and the Co-Cr-V substitutional solid solution structure is obtained. The composite powder particles prepared at different pH values all have spherical microstructure and agglomeration phenomenon. With the increase of pH value， the composite powder particles come into contact with each other and agglomerate into a large-sized block structure. When the solution pH value is low， Zeta potential and isoelectric point have large deviation， and the particles disperse well. With the increase of pH value， the powder particles agglomerate obviously， and the average particle size increases.
2018 Vol. 28 (01): 11-14 [
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Study on low temperature reduction process of superfine iron oxide
LIN Chang-ping，LI Cheng-wei，ZHANG Wu
DOI: 10.13228/j.boyuan.issn1006-6543.20160102
The process of preparing ultrafine iron powder by low temperature hydrogen reduction of ultrafine iron oxide was studied. The iron oxide powders with different particle size were obtained by high-energy ball milling， and the powders were reduced in hydrogen atmosphere at low temperature. The oxygen content was determined by nitrogen oxygen analyzer， and the reduction rate of iron oxide powder was calculated. The influence of various factors on the reduction rate was analyzed， and the optimal reduction process parameters were obtained by comparative analysis. Results show that the best reduction process parameters are： the reduction temperature is 700 ℃， the reduction time is 60 min， the average particle size of iron oxide powder is 0.8 μm， and the hydrogen flow rate is 1.0 L/min.
2018 Vol. 28 (01): 15-19 [
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Rapid microwave solid-state synthesis of Ce-doped LuAG
LI Yu，LEI Ying，DING Kai
DOI: 10.13228/j.boyuan.issn1006-6543.20160093
The Ce-doped lutetium aluminum garnet fluorescent powder with nominal composition[Lu3-xCexAl5O12][(x＝0.04～0.10)]were prepared via rapid microwave solid-state synthesis. The effect of microwave irradiation time and Ce doping amount on phase composition and luminescent property were investigated. The experimental results show that the relatively high-purity LuAG （Ce） is synthesized by microwave heating for 20-30 min. The emission peak of the LuAG （Ce） powder is 516 nm， and the excitation peaks of the powder are 342 nm and 441 nm， respectively. The luminescent properties of the powder increase with the microwave heating time in the condition of the same Ce doping amount. Most of fluorescent powders are 2-4 μm spheroidicity; the others are rod with 5-10 μm in length and 1 μm in diameter. There is a slight sintering agglomeration between the particles.
2018 Vol. 28 (01): 20-24 [
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SiCp/Al-Si composites fabricated by cold pressing and sintering-hot extrusion process
ZHU Hong-mei
DOI: 10.13228/j.boyuan.issn1006-6543.20170060
SiCp/Al-Si composites were prepared by cold pressing and sintering-hot extrusion process. The interface between the reinforcement and the matrix was analyzed by JEM-2100 high resolution electron transmission microscope （HRTEM）. Results show that the interface between the reinforcement and the matrix is clear and smooth in the heat treated SiCp/Al-Si composite. The reinforcement and the matrix have good combination and the composite has good performance. The particle reinforcement SiC and Al matrix are combined directly， （1103）SiC//（010）Al， and the mismatch[δ]is 0.020 4， the substrate phase SiC is the effective crystallization core of Al. The interface is easy to form semi-coherent interface， which is helpful to improve the bonding strength of the interface. The interface between the alloy phase Al4Cu9 and Al matrix is clear and completely incoherent. After heat treatment， the alloy phase Al4Cu9 is transformed into Al2Cu phase and uniformly distributed in the Al matrix， and the semi-coherent interface is formed.
2018 Vol. 28 (01): 25-29 [
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Experimental study on the filtration of dissolved liquid of nuclear power reactor with sintered metal microporous materials and pulse filtration technology
GU Hu，YANG Jun-jun，WANG Fan，WANG Hao，LIU Guan-ying，ZHAO Jing-hui
DOI: 10.13228/j.boyuan.issn1006-6543.20170073
Pulse filtration technology is widely used in the field of modern engineering （such as petrochemical， metallurgy， environmental protection， etc.）， but its application in the nuclear industry needs to be further developed. Using the sintered metal microporous materials of 316L and 304L stainless steel as filtration medium， and Sr（NO3）2 solution adding Al2O3 particles as simulating feed liquid， the filtration effect of the pulse filtration technology on the fine undissolved substance in the dissolving solution of nuclear power reactor was studied. The results show that the pulse filtration has a high filtration velocity of 3.50 m3/（m2·h） for the simulated material liquid. The content of undissolved substance in the filtrate is only 0.1-1.5 mg/L. The 316L and 304L stainless steel tubes used in the experiments have good filtration performance.
2018 Vol. 28 (01): 30-33 [
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Study on performance of wear-resistant coating for boiler with supersonic active arc spraying
FU Li，，，CHEN Xiao-ming，，，LIU Wei，，MA Hong-hai，
DOI: 10.13228/j.boyuan.issn1006-6543.20160096
Using FeCrNiBSi wire as coating material， the coating with high bonding strength and strong wear resistance was prepared on the surface of the industrial boiler with supersonic active arc spraying system on Q235 steel substrate. The porosity， microhardness， bonding strength and wear resistance of FeCrNiBSi coating were evaluated by metallographic observation， tensile test， friction and wear test. The microstructure and wear morphology of the coating were also observed by scanning electron microscope. The results show that the coating has good adhesion to the substrate， no separation is found at the interface. The coating structure is relatively dense with porosity of 0.71% and hardness of 720 HV0.3. The bonding strength between the coating and the matrix is 60 MPa. Compared to Q235 steel， FeCrNiBSi coating has excellent wear resistance， which is 28 times that of Q235 steel. The wear mechanism of FeCrNiBSi coating is micro-ploughing and adhesive wear. The coating has good wear resistance and good application prospect.
2018 Vol. 28 (01): 34-37 [
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Characterization of pre-alloyed TiAl powder and its microstructure characteristics after hot-pressing
KANG Fu-wei，WANG Shan-shan，SUN Jian-fei，LIU Na
DOI: 10.13228/j.boyuan.issn1006-6543.20170083
The TiAl-based pre-alloy powder prepared by gas atomization process and its vacuum hot pressing microstructure were studied by laser particle size analyzer， metallographic microscope and scanning electron microscope （SEM）. The results show that the pre-alloyed powder particles prepared by gas atomization process are fine and have good sphericity. The particle size is mainly distributed in the range of 20.0-40.0 μm. The powder particles with different size have different surface and internal morphology. The interior and surface of the small size powder show no histological features. With the further increase of the powder particle size， the surface and internal structure of the powder gradually change from the cellular dendrite to the dendrites. After vacuum hot-pressing， the dense and uniform microstructure is obtained and the internal microstructure is duplex.
2018 Vol. 28 (01): 38-44 [
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Experimental research of metal microporous membranes in filtration of methanol to olefins（MTO）chilled water
GUO Yu，WANG Qiang-bing，LI Ye，YANG Bao-jun，LI Cheng
DOI: 10.13228/j.boyuan.issn1006-6543.20170076
Metal powder microporous membrane and wire mesh microporous membrane with filtration accuracy of 1 μm were used as the core filter element in filtration of methanol to olefins（MTO）chilled water for experimental research. The change of dust concentration in chilled water， pressure difference and flow of filter during the filtration， failure cause of filter element were studied. The results show that metal powder microporous membrane and wire mesh microporous membrane can both reduce the dust concentration of chilled water below 5 mg/m3. The pressure difference is smaller， the flow is bigger during the filtration and the effect of regeneration is better when the wire mesh microporous membrane is used as the filter element relative to metal powder microporous membrane. The failure cause of the metal powder microporous membrane is aggregates （100-200 μm） bond on the surface of filter element， which is constituted of catalyst particles （1-2 μm） that wrapped in and bond together by grease in chilled water. The aggregates can be removed by the regeneration method of butanone cleaning and high pressure nitrogen purging， the relative permeability coefficient is restored to 77.7% of that before filtration.
2018 Vol. 28 (01): 45-49 [
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Study on the application of Cu-Al2O3 as matrix of diamond bit
Lü Zhong-lin，SHEN Deng-ju
DOI: 10.13228/j.boyuan.issn1006-6543.20170103
In order to improve the efficiency of diamond bit， the Cu-Al2O3 cermet composite material was used as the matrix of diamond bit to solve the problem of slow and even slipping of the bit in hard and dense weak abrasive formation. Using the hard and brittle characteristics of the material itself， to drive bit complete the self sharpening of diamond particles depend on the micro cutting and crushing stage， improve the drill grinding efficiency greatly， with stainless steel honeycomb as matrix skeleton to enhance the overall strength and ensure the service life and efficiency of diamond bit. In the experiment of silicon dolomite formation in Kaixian county of Chongqing，Cu-Al2O3 cermet based diamond bit impregnated with honeycomb overcome the difficulty of dense and high indentation hardness of the “skid” formation rock because of its excellent self-sharpening， the drilling efficiency reaches 0.5 m/h， life expectancy increases from 0.3 m to 3.0 m， solving the problem of low drilling efficiency and even bit slipping.
2018 Vol. 28 (01): 50-55 [
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Research and development of ceramic particle reinforced aluminum matrix composites
HAO Shi-ming，，MAO Jian-wei ，XIE Jing-pei
DOI: 10.13228/j.boyuan.issn1006-6543.20160105
There are many advantages for particle reinforced aluminum matrix composites （PRAMCs）， such as high specific strength， high specific stiffness， high elastic modulus， good wear-resistance， good dimensional stability and low cost. The selection principle， characteristics and the role of the reinforced particles in the metal matrix were summarized. The development status， strengthening mechanism and common preparation methods of several kinds of typical particle reinforced aluminum matrix composites were introduced. The advantages and application scope of typical preparation process， the research and application status in the related fields at home and abroad were listed. Finally， it was pointed out that the particle reinforced aluminum matrix composites was one of the important directions in current research and development， which had broad application prospects.
2018 Vol. 28 (01): 56-62 [
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Research on the application of metal additive manufacturing technology
ZHANG Yang-jun，CHEN Ying
DOI: 10.13228/j.boyuan.issn1006-6543.20170027
Metal additive manufacturing technology is an important direction of 3D printing， which has been developed for more than 30 years. Compared to traditional forming methods， it is more desirable in terms of time， efficiency， economy， and it is especially suitable for forming complicated parts. The basic principles of metal additive manufacturing， policies made worldwide， and progresses achieved by researchers at home and abroad were reviewed. It was also pointed out that metal additive manufacturing technology should solve problems such as metal powder， surface quality， forming size and international standard in order to make breakthroughs.
2018 Vol. 28 (01): 63-67 [
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Effect of liquid guide tube pressure on atomization efficiency and powder properties of Ni-based alloy
SONG Xin-qiang，LI Yu-xi，HAN Meng
DOI: 10.13228/j.boyuan.issn1006-6543.20160135
Effects of the liquid guide tube pressure （the pressure of liquid guide tube tip，[PT）]on the atomization rate （the mass of the molten metal atomized per minute，[RA）]and the physical properties of the powders during vacuum gas atomization process were investigated. The results show that， in the case of other process parameters remain unchanged， the atomization rate decreases and the adhesion of the “satellite ball” reduces effectively with the decrease of the guide tube pressure， and the loose density and fluidity of the powder improve. However， the too low pressure of the guide tube makes the atomization rate too low， and the loose density and fluidity of the powder become worse. Therefore， there is an optimum pressure value of the guide tube during the vacuum gas atomization process.
2018 Vol. 28 (01): 68-71 [
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Simulation analysis and optimization of shot blasting for powder forged connecting rod
XU Yong-gang，，WAN Jia-ming，，GAO Meng，
DOI: 10.13228/j.boyuan.issn1006-6543.20160144
Shot blasting reinforcement technology can improve the fatigue strength and service life of the powder forged connecting rod. Using PROE to establish the solid model of the shot blasting machine， the discrete element method and EDEM simulation were used to analyze the shot blasting motion law under various sub-pill rotational speed， projectile diameter and blasting angle， thus different combination of process parameters were achieved. Combining the orthogonal test method， the process parameters were optimized and the optimal scheme was verified through the test of shot blasting strength and surface coverage. The continuous and steady shot blasting reinforcement technology is determined as the sub-pill rotational speed of 2 800 r / min， the shot blasting angle of[10°]and the projectile diameter of 0.7 mm， the quality and efficiency of shot blasting are effectively improved.
2018 Vol. 28 (01): 72-75 [
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