Consolidation of low-sinterability powders with applying medium isostatic pressure

通过施加中等等静压来固结低烧结性粉末

• 批准号: 06452331
• 负责人: WATANABE Ryuzo
• 金额: $ 4.86万
• 依托单位: TOHOKU-UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452331/
• 关键词: sintering; isostatic pressure; densification mechanism; computer simulation; metal-boride system; sintering map; microstructure; ceramic powder; 焼結機構; 焼結シミュレーション; 焼結組織モデル; スーパーアロイ; 鉄合金

Sintering experiments were conducted on various alloys and ceramics powders using a sintering furnace with controllable atmosphere and pressure of ambient to 10kg/cm^2. The effects of powder characteristics, sintering temperature, applied pressure, sintering time, and heating and cooling conditions on the relative density and grain size of the sintered compacts. Iron alloy and super alloy powder could be densified to full density with pressure of 10kg/cm^2. Tool alloy powder of metal/boride system could not be sufficiently densified with such low pressure, and the higher pressure up to 500kg/cm^2 was necessary for the full densification. The grain structures, distributions of residual pores, shape and size of the precipitate were quantifield with an image analyzer, the sintering mechanisms during the microstructural evolution was studied. The sintering shrinkage rate was measured by non-contact-type dilatometric analyzer, and with the aid of the computer simulation of sintering densification kinetic equations for the shrikage rate were derived. At present the agreement between the simulation and the experimental is not good. However, the nature of the driving force for the densification was clarified, and the semi-quantitative discussion can well be made about the effect of applied pressure on the densification enhancement. For the further understanding of the sintering mechanisms a sintering map which takes into account the effects of sintering temperature, pressure, time and atmosphere has been constructed. With this sintering map the effect of pressurizing has been discussed in correlation with sintering mechanisms.

在气氛可控、常压为10 kg/cm2的烧结炉上对各种合金和陶瓷粉末进行了烧结实验。研究了粉末特性、烧结温度、外加压力、烧结时间、加热和冷却条件对烧结体相对密度和晶粒度的影响。铁合金和高温合金粉末在10 kg/cm2的压力下可以致密到全密度。金属/渗硼系统的工具合金粉末在这样的低压力下不能充分致密，需要更高的压力才能达到完全致密化。利用图像分析仪对组织结构、残余气孔分布、析出相的形状和大小进行了量化，研究了显微组织演变过程中的烧结机制。用非接触式膨胀仪测量了烧结收缩速率，并借助计算机模拟烧结致密化，推导出了收缩速率的动力学方程。目前，模拟结果与实验结果吻合较差。阐明了致密化驱动力的本质，并对外加压力对致密化的影响进行了半定量的讨论。为了进一步了解烧结机理，建立了考虑烧结温度、压力、时间和气氛影响的烧结图。根据这张烧结图，结合烧结机理讨论了加压效果。

项目成果

D.G.Ahn: "Sintering of TiB2-W Cermets by HIP and their Properties" Journal of the Japan Society of Powder and Powder Metallurgy. 43. 515-519 (1996)

D.G.Ahn：“HIP 烧结 TiB2-W 金属陶瓷及其性能”日本粉末和粉末冶金学会杂志。

Y.Yamada: "Microstructural Control of Sintered Materials-Grain Growth in Porous Compacts-" Journal of the Japan Society of Powder and Powder Metallurgy. 43. 1177-1182 (1996)

Y.Yamada：“烧结材料的微观结构控制-多孔压坯中的晶粒生长-”日本粉末和粉末冶金学会杂志。

D.-G.Ahn: "Microstructure and Mechanical Properties of TiB2-W Cermets Prepared by HIP" Materials Transactions,JIM. 37. 1078-1083 (1996)

D.-G.Ahn：“HIP 制备的 TiB2-W 金属陶瓷的微观结构和机械性能”Materials Transactions，JIM。

水野幸隆: "ステンレス鋼圧粉体の焼結収縮挙動の数値解析" 粉体および粉末冶金. 43. 1171-1176 (1996)

Yukitaka Mizuno：“不锈钢压坯烧结收缩行为的数值分析”粉末和粉末冶金。 43. 1171-1176 (1996)

Y.Kobayashi: "Synthesis of SiC-AlN Ceramic Alloys from Si, C and AlN Powder Premixture by Reaction HIP-Sintering and Their Mechanical Properties" Journal of the Ceramic Society of Japan, Int.Edition. 104. 552-556 (1996)

Y.Kobayashi：“通过反应 HIP 烧结从 Si、C 和 AlN 粉末预混合物合成 SiC-AlN 陶瓷合金及其机械性能”日本陶瓷学会杂志，国际版。