(MgO)_(0.1-x)(CaO)_x(ZrO_2)_(0.9)陶瓷的相组成、力学与抗热震性能研究  

Phase composition,mechanical properties and thermal shock resistance of (MgO)_(0.1-x)(CaO)_x(ZrO_2)_(0.9) ceramics

作　　者：樊传刚[1] 徐兰[1] 严解荣[2] 朱义文[2] 于洋[2] 李家茂[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,马鞍山243002 [2]马钢股份有限公司技术中心

出　　处：《耐火材料》2007年第2期104-107,共4页Refractories

摘　　要：首先以电熔ZrO2为主原料,以碱式碳酸镁和CaCO3为稳定剂,经混合、成型和预烧（1550℃3h）后,制成（MgO）0.1-x（CaO）x（ZrO2）0.9系列陶瓷粉体（x值分别取0、0.01、0.02、0.03、0.04、0.05、0.1）;然后将预烧后试样破碎、筛分成0.1-0.074mm的粗粒级颗粒和〈0.055mm的细粒级颗粒,分别按单一细颗粒和粗颗粒与细颗粒混合（粗、细颗粒质量比为11）两种方案进行坯体配料,经1550℃5h烧成后制成（MgO）0.1-x（CaO）x（ZrO2）0.9系列陶瓷试样,研究了稳定剂组成的相对变化对试样的相组成、体积密度、力学性能与抗热震性能的影响。结果表明（1）在稳定剂MgO、CaO总量10%（摩尔分数）不变的情况下,试样中立方相含量随着CaO量（即x值）增加而增加;当x=0.01时,陶瓷中单斜相与立方相含量之比为21,此时陶瓷具有较高的常温抗折强度和较为理想的抗热震性（1100℃水急冷5次后未出现裂纹）,而且其抗热震性受陶瓷材料致密度的影响程度较小。（2）在陶瓷粉体中增加粗粒级配料,可有效降低ZrO2陶瓷试样的致密度,提高试样的抗热震性能,但其抗折强度也随之下降。Ceramic powders of （MgO）0.1-x（CaO）x（ZrO2）0.9 （MC-ZrO2,x=0,0.01,0.02,0.03,0.04,0.05 and 0.1） were prepared using fused ZrO2 as starting material and MgCO3 and CaCO3 as stabilizers,processed by mixing,shaping and calcining （1 550 ℃ for 3 h）.Being crushed and screened into coarse grains （〈0.1-0.074 mm） and fine grains （〈0.055 mm）,two specimens were made,one consisted of individual fine grains and the other of mixture of coarse and fine grains at mass ratio of 1：1,and then fired at 1 550 ℃ for 5 h. The influence of relative changes of stabilizer composition on the phase composition, bulk density,mechanical properties and thermal shock resistance were studied. The result shows.1 ）While the total mass of the stabilizer is kept constant at 10% （mole fraction） as a premise,the amount of cubic phase increased with the increase of CaO content （ x value） ; In the case of x =0.01, i. e. the ratio of the monoclinic phase and cubic phase is 2 ： 1 ,the ceramic had higher CCS and thermal shock resistance （ no cracks was found after firing at 1 100℃ and then cooling for 5 recycles） ,which was less affected by the material density. 2） By increasing the coarse grains, the density of ZrO2 ceramic specimen was reduced so that the thermal shock resistance was improved but the crushing strength was weaken.

关 键 词：ZRO2陶瓷 部分稳定氧化锆(PSZ) 复合稳定剂 相组成 力学性能 抗热震性 

分 类 号：TQ174.758[化学工程—陶瓷工业]