面向大厚度及高强度的铁基—碳化钨梯度材料熔射成形及性能控制
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项目结题报告(全文)
1.原位碳化快速烧结WC-6Co硬质合金工艺研究
- 关键词:
- WC-Co硬质合金;原位碳化快速烧结;碳含量;烧结温度;组织结构
- 郭圣达,;鲍瑞;易健宏
- 《《中国钨业》创刊三十周年钨业发展报告会暨六届五次理事会》
- 0年
- 中国北京
- 会议
以钨粉、钴粉、碳黑、有机碳为原料,研究了W、Co和C混合粉末在放电等离子烧结系统中碳化反应快速烧结制备WC-6 wt.%Co硬质合金的原位碳化烧结工艺。系统研究了配碳量、烧结温度和加压方式对硬质合金的显微组织结构和性能的影响。结果表明:碳含量为理论值1.2倍时合金物相为纯WC和Co相,无脱碳相,也未发现游离碳;烧结温度在1 250℃时,WC晶粒均匀且无异常长大;在W、Co和C混合粉末烧结初期施加30 Mpa压强,待温度升到800℃时再将压强加到50 MPa制备的合金孔隙较少,致密化程度高。本工艺较传统制备工艺具有流程短,成本低的特点,可为硬质合金工业生产提供参考。
...2.Microstructure and properties of Fe base coatings reinforced by in-situ TiC particles using plasma jet surface metallurgy
- 关键词:
- Chromium compounds;Low carbon steel;X ray diffraction;Composite coatings;Fighter aircraft;Microhardness;Wear resistance;Interfaces (materials);Strengthening (metal);Titanium alloys ;Indium compounds;Iron;Scanning electron microscopy;Microstructure;Plasma jets;Reinforcement;Carbon steel substrates;Dispersion strengthening;Energy dispersive x-ray;Fe-based coatings;In-situ synthesized;Jet surfaces;Microstructure and properties;Particulate reinforcements
- Chen, Hao;Zhang, Yangrong;Huang, Zhu
- 《Chinese Materials Conference on Special and High Performance Structural Materials, CMC 2015》
- 2016年
- July 10, 2015 - July 14, 2015
- Guiyang, China
- 会议
By plasma jet surface metallurgy, the thick composite coatings reinforced by in-situ TiC were produced on low carbon steel. Composition, microstructures and performance were characterized by scanning electron microscope (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), micro-hardness tester and wear tester. The results showed that the excellent bonding between the coating and the carbon steel substrate was achieved by strong metallurgical interface. The microstructure of the coating is mainly composed of γ-(Fe, Ni) dendrite, M23C6, CrB and in-situ synthesized TiC ceramic particle. Because of the particulate reinforcement, the dispersion strengthening, refinement strengthening, micro-hardness and wear resistant of Fe-based coating can be enhanced.
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© 2016 Trans Tech Publications, Switzerland.3.Wear and corrosion properties of crystalline Ni-W alloy coatings prepared by electrodeposition
- 关键词:
- Nickel coatings;Sulfur compounds;Tungsten alloys;Binary alloys;Corrosion resistance;Heat treatment;Nickel compounds;Tungsten compounds;Heat resistance;Microhardness ;Corrosive effects;Microstructure;Sodium chloride;Wear resistance;Corrosion resistant coatings;Annealing temperatures;Elctrodeposition;Heat treatment temperature;Heat-treated coatings;Medium carbon steel substrate;Microhardness tester;Ni-W alloy;Sodium chloride solution
- Chen, Hao;Ren, Xingrun;Zhang, Xuehui;Li, Jinhui
- 《Chinese Materials Conference on Special and High Performance Structural Materials, CMC 2015》
- 2016年
- July 10, 2015 - July 14, 2015
- Guiyang, China
- 会议
Electroplating Ni-W coatings have been prepared on medium carbon steel substrate by using nickel sulphate and sodium tungstate as precursors. The microstructures, phase compositions and performances of the as-prepared coatings were analyzed by SEM, EDS, AFM, XRD, microhardness tester and wear tester, respectively. The surface morphologies after wearing were observed and the wear mechanism was discussed. The corrosion behaviors of the coatings before and after heat-treatments were evaluated by anodic polarization in 3.5% sodium chloride solution. The results show that no obvious flaws could be found in the Ni-W alloy coatings and there was a good bond with the matrix. The microhardness of the coatings increased with increasing heat treatment temperature, reaching its maximum value for heat treatment at 500°C, and then droped down. Wear resistance of the coatings was found to be better than that of 16 Mn steel and the heat treatment improved the hardness and wear resistance. The corrosion resistance of the heat-treated coatings increased with increasing the annealing temperature, and best corrosion resistance could be obtained at the temperature of 500°C.
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© 2016 Trans Tech Publications, Switzerland.
