摘要
以Al2O3、La2O3、Y2O3和活性碳为烧结助剂,以B4C为基体,采用真空热压烧结技术制备B4C基陶瓷,研究了稀土氧化物对B4C基陶瓷微观结构和性能的影响。结果表明,添加稀土氧化物的试样在1850℃烧结即可得到晶粒排列紧密、性能较佳的B4C基陶瓷。在未添加稀土氧化物的试样中,由于反应生成的新相Al8B4C7较少,烧结不充分,因此试样的性能较低。在添加La2O3的试样中,由于烧结比较充分,烧结体中的新相LaAlO3含量较大,显微组织较理想,因此性能较佳。在添加Y2O3的试样中,残留的Al2O3和C的量很少,生成的Y3Al5O12也较少,因此性能介于前两者之间。
The boron carbide ceramics were prepared with carbon carbide as matrix and Al2O3, La_2O_3, Y_2O_3 and active carbon as sintering agent by vacuum heat pressure sintering. Effects of the rare-earth oxide on microstructure and mechanical properties of the ceramics were investigated. The results reveal that boron carbide ceramics with compact grain structure and desirable properties can be prepared with adding rare-earth oxide and sintering at 1850℃. The prepared samples with rare-earth oxide-free exhibit low properties as a result of a little generation of new phase Al8B4C7 and inadequate sintering, while the samples with La_2O_3 exhibits a better properties and a desirable structure as a result of more fully sintering and amounts of generation of LaAlO3 phase, meanwhile, the properties of samples with Y_2O_3 where trace residual Al2O3 and C exist are in range of above two due to low Y3Al5O12 generation.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2009年第10期886-889,共4页
Special Casting & Nonferrous Alloys
基金
辽宁省自然科学基金资助项目(20062193)
辽宁省教育厅科研基金资助项目(20031008)
辽宁省专利局资助项目
关键词
B4C陶瓷
真空热压烧结工艺
稀土氧化物
烧结助剂
Boron Carbide Ceramics, Vacuum Heat Pressure Sintering, RE Oxide, Sintering Agent
