Fe-Cu-Ni-Sn基磨边轮胎体组织和性能研究

发布时间：2018-03-21 20:45

本文选题：磨边轮　切入点：铁基胎体　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着我国瓷质墙地砖产业的快速发展,各生产厂家对瓷质砖坯磨边用的金刚石磨边轮的性能也提出了更高的要求,而用于包镶金刚石磨粒的金属胎体对磨边轮的使用性能起着关键性作用。铁基胎体因价格低廉,方便配制而得到广泛的应用,但不同厂家生产的胎体性能差距很大,使得磨边轮的锋利度和寿命差异显著。本文采用光学显微镜、扫描电子显微镜及能谱分析、X射线衍射等组织分析方法,以及致密度、硬度、抗弯强度测试、耐磨性试验等性能检测手段,研究了烧结温度对单质机械混合粉、预合金粉烧结体组织性能的影响;探究了Fe-Cu-Ni-Sn基磨边轮胎体配方的烧结工艺,进一步分析了分别添加不同含量单质Zn粉、CuZnSn预合金粉对铁基胎体组织及性能的影响,从而得到综合性能较好的铁基胎体。研究结果对确定金刚石磨边轮铁基胎体的烧结工艺和粘结剂的添加量提供一定的理论依据和数据参考。结果表明,单质机械混合粉烧结体的组织主要由(Cu,Sn),(Cu,Zn)固溶体及Cu41Sn11和Cu5Zn8金属间化合物组成。随着烧结温度的升高,与单质机械混合粉烧结体组织相比,预合金粉烧结体的组织更细小,针状相更多,且物相组成中出现了新相Cu6Sn5;相同工艺条件下,两种烧结体致密度相差不大,预合金粉烧结体硬度值高于前者,但抗弯强度低于前者。升高烧结温度,延长保温时间,增大烧结压力均使得铁基胎体组织中灰色(Cu,Sn)基固溶体相数量增多,黑色相由富铁相、(?-Fe,Ni)和Fe4Cu3化合物组成,其中部分黑色组织被灰色相分散,以Ni4Sn、Cu41Sn11为主的亮灰色组织稍有减少。铁基胎体的致密度随烧结温度的升高,保温时间的延长呈先增大后减小的规律,硬度整体呈上升趋势,抗弯强度呈先增大后减小的趋势;烧结压力对致密度和硬度影响较小,抗弯强度也呈现先增大后减小的规律,耐磨性变化趋势与硬度值变化趋势类似。优化得到的铁基胎体烧结工艺为烧结温度:750℃,保温时间:3min,烧结压力:20kN,此时胎体的致密度为99.7%,硬度值为103.5HRB,抗弯强度为869.1MPa,磨损量为272.6mg。与原铁基胎体相比,添加单质Zn粉后铁基胎体组织中主要物相组成基本不变,但出现了少量Cu0.61Zn0.39相;随着Zn含量的增加,亮灰色组织逐渐减少,灰色组织逐渐增多,深灰色组织变化不明显。添加预合金粉后铁基胎体组织中出现了Cu0.61Zn0.39、CuZn2新相,其余组成相不变;随着预合金粉含量的增加,组织变化特点与添加Zn粉时类似。随着Zn或预合金粉含量的增加,铁基胎体致密度和硬度整体均呈下降趋势,抗弯强度先增大后减小,当Zn或预合金粉添加量分别为2.8wt.%和8wt.%时分别达到最大值987.5MPa和984.2MPa。在原铁基胎体和添加2.8wt.%单质Zn粉的铁基胎体及添加8wt.%预合金粉的铁基胎体中分别加入金刚石后,三者节块把持力系数分别为71.6%,78.9%,81.0%,后者的把持力系数略大于前两者;铁基胎体加入适量Zn或预合金粉后可改善与金刚石界面结合情况。
[Abstract]:With the rapid development of China's ceramic tile industry, the performance of each manufacturer of porcelain tile edge grinding with diamond grinding wheel is also put forward higher requirements, and used for the performance of metal matrix diamond abrasive grinding wheel to play a key role in the fetal body. Iron because of low price the preparation, convenient and widely used, but the gap between the matrix performance of different manufacturers, so that the grinding wheel sharpness and life significantly. In this paper, by using optical microscope, scanning electron microscope and energy spectrum analysis, X ray diffraction analysis method and organization, density, hardness, bending strength test. The performance of wear resistance test method, the effects of sintering temperature on elemental mechanical mixed powder, effects of microstructure and properties of pre alloyed powder sintering; sintering process of Fe-Cu-Ni-Sn based grinding tire body formula, further analysis With different content of elemental Zn powder. The effect of CuZnSn pre alloy powder and properties of iron-based matrix organization, so as to obtain a better performance of iron-based matrix. The results provide a theoretical basis and reference data to determine the diamond grinding wheel and sintering process of iron-based matrix of the binder content. The results show that the pure mechanical mixed powder the sintered microstructure is mainly composed of (Cu, Sn), (Cu, Zn) solid solution and the Cu41Sn11 and Cu5Zn8 intermetallic compounds. With the increase of sintering temperature, compared with the pure mechanical mixed powder sintered body, pre alloyed powder sintered body finer microstructure, more acicular phase, the emergence of new phase Cu6Sn5 the phase composition and contents; the same process conditions, two kinds of sinter density difference, pre alloyed powder sintered body hardness value is higher than the former, but the flexural strength is lower than the former. The increase of sintering temperature, prolonging holding time increasing The sintering pressure gray iron-based tissues (Cu, Sn) - based solid solution phase to increase the number of black is composed of iron rich phase, (? -Fe, Ni) and Fe4Cu3 compounds, some of them are grey black dispersion, with Ni4Sn, Cu41Sn11 as the main light gray tissue decreased slightly. The matrix the density increases with the sintering temperature increasing, the prolongation of the holding time increased first and then decreased, the hardness of the overall upward trend, the flexural strength decreased; sintering pressure to affect the density and hardness of small, flexural strength is also increased first and then decreased, and the hardness of the trend the change of wear value change trend similar. Optimization of iron-based sintering process was obtained: the sintering temperature of 750 DEG C, holding time: 3min, sintering pressure: 20kN, at this time the density matrix is 99.7%, the hardness value is 103.5HRB, the bending strength is 869.1MPa, the wear volume is 272.6m G. compared with the original iron-based, mainly iron-based powder organization element Zn is added after the phase composition is basically unchanged, but the emergence of a small amount of Cu0.61Zn0.39 phase; with the increase of Zn content, the light grey tissue gradually reduced, gray tissue gradually increased, dark gray tissue did not change significantly. The emergence of Cu0.61Zn0.39 pre alloy powder after adding iron powder the organization in the new phase of CuZn2, the rest of the composition phase unchanged; with the increase of pre alloy powder content, characteristics of organization and the addition of Zn powder. With the increase of Zn content or pre alloy powder, iron powder density and overall hardness decreased, the flexural strength increased first and then decreased, when the Zn or pre the amount of powder alloy were 2.8wt.% and 8wt.% respectively reached the maximum value of 987.5MPa and 984.2MPa. in the original matrix and adding 2.8wt.% elemental Zn powder of iron powder and adding 8wt.% pre alloy powder body respectively in fetal iron After joining diamond, the holding force coefficients of the three parts are 71.6%, 78.9% and 81%, respectively. The holding force coefficient of the latter is slightly larger than that of the first two. The addition of Zn or pre alloyed iron matrix can improve the interface bonding with diamond.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ174.76;TG74

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