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New rare-earth pigments to pigment

Author: WangYuXiang
Tutor: ZhongShengWen
School: Jiangxi University of Technology
Course: Materials Science
Keywords: Molten salt method Crystal growth Crystal morphology Color Nd3SO6 powder The discolored powder Nd3 - xAlxSO6
CLC: TQ628.2
Type: Master's thesis
Year: 2009
Downloads: 112
Quote: 0
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Abstract


China is rich in rare earth resources to carry out the new rare-earth discoloration pearlescent pigments have important theoretical and practical significance . In this paper, neodymium element coloring , very unique color effects of this feature, the use of molten salt synthesis of neodymium discoloration pearlescent pigments , combined with molten salt chemistry , crystal growth , inorganic materials science and other fields of theoretical knowledge and research methods, systematic study of the the Nd- color pearlescent pigment synthesis process parameters , and the system had discoloration pearlescent pigment Nd , 3 < / sub > SO 6 < / sub > and discoloration pearlescent pigments Nd3 - xAlxSO6 . In the molten salt process , change the molten salt type and amount of synthesis temperature and holding time , study the impact of external physical and chemical conditions of neodymium discoloration powder crystal growth . The results show that : the type of molten salt affect the morphology of the discoloration powder , sodium sulfate is the most suitable for the molten salt synthesis of neodymium - based pearlescent pigments molten salt ; molten salt consumption directly affects the size of the flake powder and morphology, too little molten salt leads to lack of space to grow , the grain can not be free growth , excessive molten salt can cause a small number of abnormal grain growth ; synthesis temperature increases , the mass transfer rate increases of molten salt crystal crystallization trend in good condition ; holding time is conducive to the growth of crystals , but too much to extend the holding time increases the size of the flake powder is not very obvious . Neodymium discoloration powder was characterized using SEM, XRD, EDAX, laser particle size detection means to explore the refined the discolored powder of neodymium conditions . The research results show that : the neodymium complex salt and sodium sulfate as raw materials, over sodium sulfate and neodymium ion molar ratio of 3:1 for 4 hours at 1250 ° C molten salt obtained in particle diameter D50 of 53.51μm discoloration powder Nd 3 SO 6 ; neodymium oxide , aluminum sulfate , sodium sulfate as the raw material , the mass ratio of sodium sulfate and aluminum sulfate is 1:1 , treated at 1200 ° C molten salt 5 hours, can be obtained in particle size D50 of 31.94μm discoloration powder Nd3 - xAlxSO6 . Discoloration powder Nd 3 SO 6 and discoloration Powder Nd3-xAlxSO6 a good acid and alkali resistance and color effects .

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CLC: > Industrial Technology > Chemical Industry > Pigment Industry > Special pigment > Photoluminescent pigments
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