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2018 Vol. 28, No. 05
Published: 2018-10-10
1
Research progress of boron-containing neutron absorber materials
LIU Gui-rong，PEI Yan-bin
DOI: 10.13228/j.boyuan.issn1006-6543.20180095
Because neutron absorption cross-section of boron is large，boron-containing neutron absorber materials are widely used in fuel storage， transportation and neutron shielding protection. The main preparation methods， basic properties and application of B4C/Al， boron stainless steel， boron containing polymers and Al/W/WC/B4C composite material were discussed.
2018 Vol. 28 (05): 1-5 [
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Effect of mechanical alloying on the microstructure of Cu60Cr40 alloy by microwave sintering
YIN Su-hua，FU Jun-wei，DONG Zhong-qi，WANG Yang
DOI: 10.13228/j.boyuan.issn1006-6543.20170035
Cu60Cr40 alloy was prepared by mechanical alloying， cold pressing and microwave sintering. The influence of ball milling time on powder size and microstructure of the alloy was studied. The results show that the Cu60Cr40 alloy powder is lamellar. When milled for 36-60 h， the particle size decreases and the alloying degree increases with the milling time increases. After 500 MPa cold pressing， the fracture surface of Cu60Cr40 alloy compacts shows a typical crystal sugar-like fracture morphology， and the degree of plastic deformation is relatively high. The microstructure of Cu60Cr40 alloy sintered by microwave gradually transforms into equiaxed crystals. The distribution of Cu-rich phase and Cr-rich phase is relatively uniform， and the pores are significantly reduced.
2018 Vol. 28 (05): 6-10 [
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Study on agglomeration and elimination methods of fine tungsten powder
ZHANG Ying-ying，，，ZHOU Wu-ping，WANG Tie-jun，WANG Xue-bing，，YANG Huai-chao，LIANG Jun-cai
DOI: 10.13228/j.boyuan.issn1006-6543.20170016
Fine tungsten powder has the characteristics of fine particles， high activity， high specific surface area， etc. Its dispersibility is poor， and it is easy to agglomerate， resulting in poor flowability and low loose density， which seriously affect the following spheroidization reslut of tungsten powder. The agglomeration causes of fine tungsten powder and the influence of agglomeration on spheroidization were discussed and summarized， and the agglomeration of fine tungsten powder was solved by ball milling experiment. After ball milling， the particle size and distribution of fine tungsten powder are decreased and narrowed， the values of[D10，][D50]and [D90]are decreased from 8.446， 20.186 and 45.686 μm to about 4.393， 6.289 and 9.573 μm， respectively. The large agglomerates are dispersed， tungsten powder is mostly in a single particle state， and the particles are well dispersed. The optimum process parameters are obtained as the ball-to-material ratio is 4∶1 （mass ratio）， the ball milling time is 3 h， and the rotating speed is 100 r/min.
2018 Vol. 28 (05): 11-16 [
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Study on microstructure and friction properties of[Al-xMg-12Sn]alloy powder for car prepared by mechanical alloying
JIA Jian-bo
DOI: 10.13228/j.boyuan.issn1006-6543.20170045
[Al-xMg-12Sn]alloy powder was prepared by mechanical alloying method， and then the powder was pressed and sintered. The effect of Mg addition on microstructure and friction properties of Al-12Sn alloy was studied by X-ray diffraction and scanning electron microscopy. The results show that the addition of Mg makes Sn finer and distribute evenly on the Al matrix. At the same time， Mg destroys the oxide film on the surface of Al particles and increases the sintering activity of Al-12Sn alloy powder. The wear resistance of Al-12Sn alloy powder is significantly improved by adding an appropriate amount of Mg. The alloy has the best mechanical properties and wear resistance when the mass percent of Mg is 0.8%.
2018 Vol. 28 (05): 17-20 [
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21
Silver-coated nano-titanium dioxide in wastewater treatment and its photocatalytic degradation of methylene blue
Lü Fang，GUO Li-da
DOI: 10.13228/j.boyuan.issn1006-6543.20180109
Methylene blue has the characteristics of bright color， high fixing rate and good color fastness， and it has become the fastest growing dye. However， a large amount of waste water is generated during use， which is difficult to biodegrade. Aminated nano-titanium dioxide was prepared by using tetraethyl titanate and 3-aminopropyltrimethoxysilane as raw materials， and then the prepared titanium dioxide was treated with 2% （mass percent） silver nitrate solution to prepare silver-coated nano-titanium dioxide A， B and C. The obtained titanium dioxide was characterized by infrared spectroscopy， and the photocatalytic degradation properties were examined by methylene blue solution. The results show that the silver-coated nano-titanium dioxide B has the best degradation effect on methylene blue， the degradation rate is above 95%， which can fully meet the requirments of industrialized continuous treatment of wastewater.
2018 Vol. 28 (05): 21-25 [
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26
Study on the performance of bimetal proportion interweaving structure based on additive manufacturing technology
CHENG Wei-qin，，ZHOU Qi，ZHANG Yu-cen，XU Jian-yu，XU Zhi-yong
DOI: 10.13228/j.boyuan.issn1006-6543.20170068
In order to increase the toughness of austenitic high-nitrogen steel， on the premise of ensuring its strength， austenitic high-nitrogen steel and austenitic stainless steel 308L wires were used to prepare the primary bionic bimetal interweaving structure by imitating the mother-of-pearl layer of biological materials such as shells through additive manufacturing technology using plasma arc as a heat source. The results show that when the volume ratio of high nitrogen steel to stainless steel is 3∶1， the tensile strength of the bimetal interweaved primary bionic structure prepared by plasma arc additive manufacturing technology is equal to that of high nitrogen steel， and the impact absorption work is increased by 2.3 times. Through the study of plasma arc bimetal interweaving structure additive manufacturing technology， it is proved that when the volume ratio of hard material to soft material in bionic structure is 3∶1， the material strength is ensured and even improved with the obtained interweaving structure， and the impact toughness of the material is also increased， which provides certain reference for the future study of bionic structure.
2018 Vol. 28 (05): 26-32 [
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33
Study on torsional properties and energy absorption capability of square tubes filled with high specific strength aluminum foam
WANG Zhan-guang，WANG Yang，PAN Chang-ren，LI Jie
DOI: 10.13228/j.boyuan.issn1006-6543.20170039
The torsional and energy absorption properties of square tubes filled with aluminum foam before and after high temperature heating were studied. The results show that the torsion curve of steel tubes filled with aluminum foam is similar to that of room temperature after high temperature heating， which is divided into four stages. The energy absorption curve is almost linear before and after high temperature heating. After heating at a maximum temperature of 1 000 ℃， the torsional carrying capacity and energy absorption capacity of steel tubes filled with aluminum foam both decrease significantly.
2018 Vol. 28 (05): 33-36 [
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37
Microstructure and properties of Mg-9Al-1Si composites reinforced by SiC particles
YU Xiu-tao，GUO Zhi-jun
DOI: 10.13228/j.boyuan.issn1006-6543.20170009
The microstructure and mechanical properties of SiC particle reinforced Mg-9Al-1Si composite were studied. The results show that the composite matrix consists of α-Mg， β-Mg17Al12 and Mg2Si. SiC particles are grayish white and spherical， regular in shape and evenly distributed. After SiC particles are added， the average grain size of the composite matrix decreases from 166 μm to 118 μm. The tensile strength， yield strength and elongation of Mg-9Al-1Si composites reinforced by SiC particles are better than those of Mg-9Al-1Si composites without SiC particles at room temperature， increasing 37.6%， 58.8% and 56.5% respectively. After SiC particles are added， many elongated tearing edges appear in the tensile fracture morphology of the composite， dimples and a small number of cleavage steps also appear in some areas.
2018 Vol. 28 (05): 37-40 [
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41
Effects of different kinds of graphite and carbon fiber on the properties of copper-based powder metallurgy friction materials
ZHANG Fa-ting
DOI: 10.13228/j.boyuan.issn1006-6543.20170021
The effects of natural graphite， dense graphite and their mixture with 0.1% （mass percent） carbon fiber on the tribological properties of copper-based powder metallurgy friction materials were studied. The results show that graphite can form a lubricant film on the friction surface， and the graphite film generated by natural graphite is more stable. Under the condition of low-speed friction， the friction coefficient is increased by 8.5% when dense graphite is mixed with carbon fiber， and the heat dissipation effect of the material is improved. Compared with dense graphite， the friction coefficient of natural graphite is basically the same， and the friction temperature rise is reduced by 1～3 ℃.
2018 Vol. 28 (05): 41-45 [
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46
Uncertainty evaluation of oxygen content in electrolytic iron powder by pulse melting reduction-infrared absorption method
MA Cheng-xin，SHI Xiao-hua
DOI: 10.13228/j.boyuan.issn1006-6543.20170030
According to the procedure of measurement uncertainty in analysis and testing， and combined with the measurement and analysis principle of oxygen analyzer， the uncertainty of determining oxygen content in electrolytic iron powder by pulse melting reduction-infrared absorption method was evaluated. Through analysis of the measurement process， the establishment of mathematical model， each uncertainty component was calculated. Results show that the relative standard uncertainty caused by measurement repeatability is 0.002 360， the relative standard uncertainty caused by standard substances is 0.000 188， the relative standard uncertainty caused by instrument calibration is 0.000 584， the relative standard uncertainty caused by sample weighing is 0.004 350， and the relative standard uncertainty caused by instrument indication value is very small and negligible， thus obtaining an expanded uncertainty of 0.000 490%. The result of determination of oxygen content in electrolytic iron powder by pulse melting reduction-infrared absorption method is as follows： [WM＝(0.048 800±0.000 490)%，][k＝2.]It provides a theoretical basis for the accuracy of oxygen content determination of electrolytic iron powder.
2018 Vol. 28 (05): 46-49 [
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50
Microstructure and electromagnetic shielding performance of plasma-sprayed Fe-Co-based amorphous alloy coatings
NI Xiao-jun，，BO Xi-hui，，ZHAO Xin-bin，，LU Zhi-chao，
DOI: 10.13228/j.boyuan.issn1006-6543.20170046
Fe36Co36B20Nb4Si4 alloy powders were prepared by gas atomization technology. Amorphous Fe36Co36B20Nb4Si4 alloy coatings with thickness of about 0.2-0.3 mm were formed by air plasma-spraying the powders onto the H62 brass substrates and aluminium pipes. The results show that the Fe36Co36B20Nb4Si4 alloy coating is almost completely amorphous， and the hardness of the coating is as high as 1 200 HV. The samples coated with Fe36Co36B20Nb4Si4 coating have good shielding performance for both direct current magnetic field and high frequency electromagnetic field. The shielding efficiency is 25 dB at 800 A/m direct current magnetic field and 80 dB at 300 kHz-1.5 GHz frequency band.
2018 Vol. 28 (05): 50-54 [
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Effect of drawing deformation rate on microstructure and hardness of Al2O3 particle reinforced Cu matrix composites
LI Zhi-yong
DOI: 10.13228/j.boyuan.issn1006-6543.20170047
The influence of drawing deformation rate on microstructure and hardness evolution of Al2O3 particle reinforced Cu matrix composite was studied. The results show that spherical nano-sized Al2O3 strengthening phase particles with a size of 30-60 nm are dispersed in the matrix. After drawing treatment， the deformation of the composites increases， and dislocation tangled interfaces and banded structures are formed in the grains. With the increase of drawing deformation rate， the grain parallel to the drawing direction is obviously elongated， and the aspect ratio of the alloy grain is also obviously increased. Al2O3 particle-reinforced Cu matrix composite has work hardening phenomenon during drawing. A large number of dislocations occur in the matrix. Dispersed Al2O3 particles produce significant pinning effect on these dislocations， thus inhibiting the movement of matrix dislocations.
2018 Vol. 28 (05): 55-58 [
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Corrosion behavior and mechanism of bonded NdFeB magnets
XIAO Kai-ye，XU Hai，ZHENG Xiao-jing，ZHENG Wen，GUO Zhi-wei
DOI: 10.13228/j.boyuan.issn1006-6543.20170043
As a permanent magnet material with high magnetic energy product， bonded NdFeB magnets have been widely used in aerospace， nuclear industry， transportation and other fields. Its raw material is NdFeB rapid quenching powder. The NdFeB magnets are easy to corrode in air environment， in order to ensure the reliability and life of bonded NdFeB magnets， the corrosion behavior of magnets with corrosion defect after protective treatment was studied. It is found that the corrosion grows continually and the magnetic performance decreases even though the magnet has reliable coating protection. The corrosion rates of magnets with different damage degrees are different. With the increase of corrosion time， the previous corrosion product Fe2O3 reacts with water to produce H2， accelerating the corrosion of damaged magnets.
2018 Vol. 28 (05): 59-64 [
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Research status of friction and wear properties and mechanism of automotive cam materials
WANG Rui，WANG Lin-shan，，，LIANG Xue-bing，，，ZHANG Wang，WANG Li-min，，，ZHANG Shao-ming
DOI: 10.13228/j.boyuan.issn1006-6543.20170018
The automobile camshaft controls the intake and exhaust valves of the engine. The common failure mode of the camshaft is cam wear. The wear resistance of the cam has an important influence on the service life of the camshaft. The friction and wear testing methods of cam materials were introduced， the research status of friction and wear properties of casting， forging and powder metallurgy cam materials and the influence of microstructure on their wear resistance were discussed， the friction and wear mechanism of cam materials were also summarized， and some suggestions on the research of cam wear mechanism were finally put forward.
2018 Vol. 28 (05): 65-70 [
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Current status and development trend of powder metallurgy press technology
CHEN Hu，HUANG Li-yan
DOI: 10.13228/j.boyuan.issn1006-6543.20170038
Due to the advantages of powder metallurgy materials， products and technologies， which is easy to realize intelligent manufacturing， energy conservation， emission reduction and resource utilization， high production efficiency and low cost. Powder metallurgy materials， products and technologies are widely used in the fields of transportation， machinery， electronics， aerospace and other fields， and the market demand is great. Powder metallurgy press， as the key equipment for forming in powder metallurgy production process， has broad market space. The market of powder metallurgy press in automobile and motorcycle industry was analyzed. The research status of powder metallurgy press technology at home and abroad was emphatically elaborated. The development trend of powder metallurgy press was proposed： large tonnage， precision and intelligence， which provides reference for the further development of powder metallurgy press.
2018 Vol. 28 (05): 71-74 [
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Research progress of Nd-Y-Fe-B permanent magnet alloy
ZHENG Meng，FANG Yi-kun，ZHOU Dong，JIANG Zhi-yu，ZHU Ming-gang， LI Wei
DOI: 10.13228/j.boyuan.issn1006-6543.20170052
With the rapid development of Nd-Fe-B magnets， it is of great significance to make rational use of relatively cheap rare earth elements such as La， Ce， Y to reduce production costs. Studying the influence of Y substitution on the magnetic properties of Nd-Y-Fe-B magnets is helpful to the development of other novel magnets. The effects of Y substitution for Nd or Fe on the magnetic properties of rare earth permanent magnet materials were summarized， including the intrinsic magnetic properties of Nd-Y-Fe-B alloy， the magnetic properties of Nd-Y-Fe-B sintered magnet， and the magnetic properties and microstructure of Nd-Y-Fe-B nanocrystalline magnet.
2018 Vol. 28 (05): 75-80 [
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Airflow classification practice of ultra-fine micron spherical silver powder
HA Min，ZHENG Wei，LI Guang-kun，HU Nan，ZHONG Xiang，SHI Wen-feng
DOI: 10.13228/j.boyuan.issn1006-6543.20170048
The airflow classification process of ultrafine spherical silver powder with particle size of 0.500-3.000 μm was introduced. Spherical silver powder with three sections of particle sizes was obtained by changing the rotating frequency of the grading wheel to simulate multi-stage grading conditions. Results show that the particle size distribution of the graded product becomes narrow， and the particle size of the spherical silver powder in the middle section is 1.000-1.500 μm. The PV conversion efficiency of solar paste fabricated with middle section silver powder is significantly improved.
2018 Vol. 28 (05): 81-83 [
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