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Microstructure manipulations to attain densification without distortion during liquid phase sintering.

機(jī)譯：進(jìn)行微觀結(jié)構(gòu)處理以在液相燒結(jié)過(guò)程中獲得致密化而不會(huì)變形。

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Liquid phase sintering provides a means for net-shape manufacturing, but there is a common concern about shape distortion during densification. In the present work, a theory is created to achieve densification without distortion by manipulating microstructure and its evolution during sintering.; The microstructure parameters considered in this study are solid volume fraction, dihedral angle, green porosity, and green pore size. These parameters were varied to measure densification and distortion behavior during liquid phase sintering using W-Ni-Cu alloys. Green compacts were formed using ethylene-bis-stearamide as a pore-forming agent with the amount of polymer controlling the initial porosity. Different initial pore sizes were generated by varying the polymer particle size. Dihedral angle was varied by changing the Ni:Cu ratio in the alloys. Finally, the solid volume fraction was adjusted via the tungsten content. Dilatometry was employed to measure shrinkage and shrinkage rate during heating. Distortion was quantified using final compact profiles determined with a coordinate measuring machine to calculate a distortion parameter.; Sintering results showed that solid volume fraction and dihedral angle are dominant factors on densification and distortion during liquid phase sintering. Distortion decreased with increasing solid volume fraction and dihedral angle, both contributing to a higher solid contiguity. Densification decreased with increasing green porosity and pore size, while initial pore structure did not show observable effects on distortion in situations of fast densification where full density is achieved.; Real time video imaging and quenching results verified that densification and distortion are sequential events in liquid phase sintering with densification occurring first. In gravity, distortion is inhibited until pores are closed and the compact is nearly fully densified.; Based on the experimental results, some processing strategies emerge that achieve densification and prevent distortion in liquid phase sintering. Microgravity experiments are proposed for further understanding of microstructure effects on densification and distortion in liquid phase sintering.
機(jī)譯：液相燒結(jié)提供了制造凈形的手段，但是人們普遍關(guān)注致密化過(guò)程中的形變。在當(dāng)前的工作中，創(chuàng)建了一種理論，以通過(guò)操縱微觀結(jié)構(gòu)及其在燒結(jié)過(guò)程中的演變來(lái)實(shí)現(xiàn)致密化而不會(huì)變形。在這項(xiàng)研究中考慮的微觀結(jié)構(gòu)參數(shù)是固體體積分?jǐn)?shù)，二面角，生坯孔隙率和生坯孔徑。改變這些參數(shù)以測(cè)量使用W-Ni-Cu合金進(jìn)行液相燒結(jié)時(shí)的致密化和變形行為。使用乙烯-雙-硬脂酰胺作為成孔劑，并控制初始孔隙率的聚合物的量形成生坯。通過(guò)改變聚合物粒度產(chǎn)生不同的初始孔徑。通過(guò)改變合金中的Ni：Cu比來(lái)改變二面角。最后，通過(guò)通過(guò)調(diào)整鎢含量。使用熱膨脹法測(cè)量加熱期間的收縮率和收縮率。使用由坐標(biāo)測(cè)量機(jī)確定的最終致密輪廓來(lái)量化變形，以計(jì)算變形參數(shù)。燒結(jié)結(jié)果表明，固相體積分?jǐn)?shù)和二面角是液相燒結(jié)過(guò)程中致密化和變形的主要因素?；冸S著固體體積分?jǐn)?shù)和二面角的增加而減小，這兩者都導(dǎo)致較高的固體鄰接度。致密化隨生坯孔隙率和孔隙尺寸的增加而降低，而在獲得完全密度的快速致密化情況下，初始孔結(jié)構(gòu)未顯示出對(duì)變形的明顯影響。實(shí)時(shí)視頻成像和淬火結(jié)果證實(shí)，致密化和變形是液相燒結(jié)中的順序事件，致密化首先發(fā)生。在重力作用下，變形被抑制，直到孔被封閉并且壓實(shí)體幾乎完全致密。根據(jù)實(shí)驗(yàn)結(jié)果，出現(xiàn)了一些可以實(shí)現(xiàn)致密化并防止液相燒結(jié)變形的加工策略。為了進(jìn)一步了解微觀結(jié)構(gòu)對(duì)液相燒結(jié)中的致密化和變形的影響，提出了微重力實(shí)驗(yàn)。

著錄項(xiàng)

  • 作者

    Yi, Wuwen.;

  • 作者單位

    The Pennsylvania State University.;

  • 授予單位 The Pennsylvania State University.;
  • 學(xué)科 Engineering Metallurgy.; Engineering Materials Science.
  • 學(xué)位 Ph.D.
  • 年度 2001
  • 頁(yè)碼 200 p.
  • 總頁(yè)數(shù) 200
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類(lèi) 冶金工業(yè);工程材料學(xué);
  • 關(guān)鍵詞

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