摘要
采用加KH-550偶联剂和高速搅拌的方法,将不同量的纳米炭黑N220均匀分散在酚醛树脂中,制成纳米炭黑-酚醛树脂复合结合剂,研究了纳米炭黑含量对复合结合剂黏度及其经1500℃炭化后碳结构的影响,并采用这些复合结合剂制备了w(C)=3%的低碳镁碳试样。研究了纳米炭黑含量(相对于酚醛树脂的质量分别为0、2.5%、5%、10%和15%)对低碳镁碳试样力学性能的影响,同时还与将纳米炭黑以预混合粉方式加入的低碳镁碳试样的力学性能进行了对比。结果发现:1)随着纳米炭黑含量的增加,复合结合剂的黏度迅速增大;2)纳米炭黑-酚醛树脂复合物经1500℃炭化后的碳结构呈光学同向性,但其微气孔数量减少,微气孔尺寸减小,碳结构的石墨化程度提高;3)随着纳米炭黑加入量的增加,低碳镁碳试样的常温抗折强度、高温抗折强度和常温耐压强度逐渐增大;4)将纳米炭黑直接分散在细粉中加入时,试样的常温抗折强度、高温抗折强度和常温耐压强度均比以纳米炭黑-酚醛树脂方式加入时差。
Nanometer carbon black -phenclic resin composite binders were prepared by dispersing evenly various amounts of nanometer carbon black N220 in phenolic resin by adding KH -.550 coupling agent and high- speed mixing. Effects of nanometer carbon black content on viscosity of the composite binders and carbon structure of them after carbonizing at 1500 ~C were studied. Low carbon MgO - C specimens （w（C） = 3% ） were prepared with these composite binders. Effects of nanometer carbon black contents （0,2.5%, 5%, 10% and 15% of phenolic resin by mass,respectively） on mechanical properties of low carbon MgO - C specimens were investigated, and mechanical properties of low carbon MgO -C specimens added nanometer carbon black by premixing powder were investigated for comparison. The results showed that= （l）The viscosity of the composite binder increased rapidly with nanometer carbon black content increasing; （2）The carbon structure of the nanometer carbon black -phenolic resin composite binder after carbonizing at 1 500 ~C showed optical isotropy, but the micro-pores amount and size decreased, and the degree of graphitization enhanced; （3） CMOR, HMOR and CCS of the specimens increased gradually with nanometer carbon black content increasing; （4）CMOR, HMOR and CCS of the specimens added nanometer carbon black by premixing powder were worse than those by carbon black -phenolic resin composite binder.
出处
《耐火材料》
CAS
北大核心
2008年第3期165-168,共4页
Refractories
关键词
纳米炭黑
分散方法
低碳镁碳材料
力学性能
Nanometer carbon black, Dispersion method, Low carbon magnesia carbon materials, Mechani- cal properties
