本文選題：磨邊輪　切入點：鐵基胎體　出處：《鄭州大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著我國瓷質墻地磚產(chǎn)業(yè)的快速發(fā)展,各生產(chǎn)廠家對瓷質磚坯磨邊用的金剛石磨邊輪的性能也提出了更高的要求,而用于包鑲金剛石磨粒的金屬胎體對磨邊輪的使用性能起著關鍵性作用。鐵基胎體因價格低廉,方便配制而得到廣泛的應用,但不同廠家生產(chǎn)的胎體性能差距很大,使得磨邊輪的鋒利度和壽命差異顯著。本文采用光學顯微鏡、掃描電子顯微鏡及能譜分析、X射線衍射等組織分析方法,以及致密度、硬度、抗彎強度測試、耐磨性試驗等性能檢測手段,研究了燒結溫度對單質機械混合粉、預合金粉燒結體組織性能的影響;探究了Fe-Cu-Ni-Sn基磨邊輪胎體配方的燒結工藝,進一步分析了分別添加不同含量單質Zn粉、CuZnSn預合金粉對鐵基胎體組織及性能的影響,從而得到綜合性能較好的鐵基胎體。研究結果對確定金剛石磨邊輪鐵基胎體的燒結工藝和粘結劑的添加量提供一定的理論依據(jù)和數(shù)據(jù)參考。結果表明,單質機械混合粉燒結體的組織主要由(Cu,Sn),(Cu,Zn)固溶體及Cu41Sn11和Cu5Zn8金屬間化合物組成。隨著燒結溫度的升高,與單質機械混合粉燒結體組織相比,預合金粉燒結體的組織更細小,針狀相更多,且物相組成中出現(xiàn)了新相Cu6Sn5;相同工藝條件下,兩種燒結體致密度相差不大,預合金粉燒結體硬度值高于前者,但抗彎強度低于前者。升高燒結溫度,延長保溫時間,增大燒結壓力均使得鐵基胎體組織中灰色(Cu,Sn)基固溶體相數(shù)量增多,黑色相由富鐵相、(?-Fe,Ni)和Fe4Cu3化合物組成,其中部分黑色組織被灰色相分散,以Ni4Sn、Cu41Sn11為主的亮灰色組織稍有減少。鐵基胎體的致密度隨燒結溫度的升高,保溫時間的延長呈先增大后減小的規(guī)律,硬度整體呈上升趨勢,抗彎強度呈先增大后減小的趨勢;燒結壓力對致密度和硬度影響較小,抗彎強度也呈現(xiàn)先增大后減小的規(guī)律,耐磨性變化趨勢與硬度值變化趨勢類似。優(yōu)化得到的鐵基胎體燒結工藝為燒結溫度:750℃,保溫時間:3min,燒結壓力:20kN,此時胎體的致密度為99.7%,硬度值為103.5HRB,抗彎強度為869.1MPa,磨損量為272.6mg。與原鐵基胎體相比,添加單質Zn粉后鐵基胎體組織中主要物相組成基本不變,但出現(xiàn)了少量Cu0.61Zn0.39相;隨著Zn含量的增加,亮灰色組織逐漸減少,灰色組織逐漸增多,深灰色組織變化不明顯。添加預合金粉后鐵基胎體組織中出現(xiàn)了Cu0.61Zn0.39、CuZn2新相,其余組成相不變;隨著預合金粉含量的增加,組織變化特點與添加Zn粉時類似。隨著Zn或預合金粉含量的增加,鐵基胎體致密度和硬度整體均呈下降趨勢,抗彎強度先增大后減小,當Zn或預合金粉添加量分別為2.8wt.%和8wt.%時分別達到最大值987.5MPa和984.2MPa。在原鐵基胎體和添加2.8wt.%單質Zn粉的鐵基胎體及添加8wt.%預合金粉的鐵基胎體中分別加入金剛石后,三者節(jié)塊把持力系數(shù)分別為71.6%,78.9%,81.0%,后者的把持力系數(shù)略大于前兩者;鐵基胎體加入適量Zn或預合金粉后可改善與金剛石界面結合情況。
[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.

【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ174.76;TG74

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相關碩士學位論文 前1條

1 孫為云;Fe-Cu-Ni-Sn基磨邊輪胎體組織和性能研究[D];鄭州大學;2017年

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本文編號：1645472