金刚石与磨料磨具工程
金剛石與磨料磨具工程
금강석여마료마구공정
DIAMOND & ABRASIVES ENGINNERING
2015年
1期
31-34,43
,共5页
Si粉%锆刚玉%过渡塑性相工艺%抗折强度%抗热震性
Si粉%鋯剛玉%過渡塑性相工藝%抗摺彊度%抗熱震性
Si분%고강옥%과도소성상공예%항절강도%항열진성
Si powder%corundum-zirconia%transient plastic phase processing%modulus of rupture%thermal shock resistance
将质量分数4%、6%、8%和10%的 Si 粉引入到锆刚玉材料中,采用过渡塑性相工艺,并在埋炭条件下于1500℃保温3 h烧成,制备出了SiC-SiAlON结合锆刚玉材料。研究表明：Si 粉不仅起塑性相成型的作用,并可促进烧结,改善锆刚玉材料的强度和抗热震性。质量分数10% Si粉试样的常温抗折强度和残余强度保持率分别为33 MPa和85%,较未添加Si粉的试样分别提高了24 MPa和16%。高温抗折强度则在Si粉质量分数为8%时最大,为8 MPa,为未添加 Si 粉试样的2.3倍。锆刚玉材料强度和抗热震性的提高归因于原位反应生成的纤维状β-SiC 和少量粒状的 O'-SiAlON 填充在锆刚玉骨架中所起的强化作用,及裂纹遇到SiC纤维时通过桥联和偏转等所起的增强增韧作用。
將質量分數4%、6%、8%和10%的 Si 粉引入到鋯剛玉材料中,採用過渡塑性相工藝,併在埋炭條件下于1500℃保溫3 h燒成,製備齣瞭SiC-SiAlON結閤鋯剛玉材料。研究錶明：Si 粉不僅起塑性相成型的作用,併可促進燒結,改善鋯剛玉材料的彊度和抗熱震性。質量分數10% Si粉試樣的常溫抗摺彊度和殘餘彊度保持率分彆為33 MPa和85%,較未添加Si粉的試樣分彆提高瞭24 MPa和16%。高溫抗摺彊度則在Si粉質量分數為8%時最大,為8 MPa,為未添加 Si 粉試樣的2.3倍。鋯剛玉材料彊度和抗熱震性的提高歸因于原位反應生成的纖維狀β-SiC 和少量粒狀的 O'-SiAlON 填充在鋯剛玉骨架中所起的彊化作用,及裂紋遇到SiC纖維時通過橋聯和偏轉等所起的增彊增韌作用。
장질량분수4%、6%、8%화10%적 Si 분인입도고강옥재료중,채용과도소성상공예,병재매탄조건하우1500℃보온3 h소성,제비출료SiC-SiAlON결합고강옥재료。연구표명：Si 분불부기소성상성형적작용,병가촉진소결,개선고강옥재료적강도화항열진성。질량분수10% Si분시양적상온항절강도화잔여강도보지솔분별위33 MPa화85%,교미첨가Si분적시양분별제고료24 MPa화16%。고온항절강도칙재Si분질량분수위8%시최대,위8 MPa,위미첨가 Si 분시양적2.3배。고강옥재료강도화항열진성적제고귀인우원위반응생성적섬유상β-SiC 화소량립상적 O'-SiAlON 전충재고강옥골가중소기적강화작용,급렬문우도SiC섬유시통과교련화편전등소기적증강증인작용。
SiC-SiAlON bonded corundum-zirconia materials were prepared via the transient plastic phase,buried in carbon at 1500 ℃ for 3 h.Corundum-zirconia powder,added with Si powder of different mass fractions(4%,6%,8% and 10%),was used as starting material.The results showed that Si powder not only played a role in plastic phase molding,but also promoted the sintering process and improved the modulus of rupture and thermal shock resistance of corundum-zirconia material. When 1 0% Si powder was added,the values of cold modulus of rupture and residual strength ratio were 33 MPa and 85%,respectively.Compared with the sample without Si powder addition,they were increased by 24 MPa and 16%.And the maximum hot modulus of rupture was obtained at 8% Si powder,which was 8 MPa,about 2.3 times compared with that of the sample without Si powder addition.The improvement of modulus of rupture and thermal shock resistance of corundum-zirconia materials was attributed to SiC and SiAlON,which were interspersed in corundum-zirconia skeleton structure leading the strengthening. In addition, when cracks met SiC fibres, which resulted in strengthening and toughening effects by the bridging traction and the deflection,then improved the modulus of rupture and thermal shock resistance of corundum-zirconia materials.
