公开(公告)号：WO1996006881A2

公开(公告)日：1996-03-07

申请号：PCT/US1995011006

申请日：1995-08-29

Applicant: DTM CORPORATION

Inventor： DTM CORPORATION ,  DICKENS, Elmer, Douglas, Jr. ,  LEE, Biing, Lin ,  TAYLOR, Glenn, ALfred ,  MAGISTRO, Angelo, Joseph ,  NG, Hendra ,  McALEA, Kevin, P. ,  FORDERHASE, Paul, F.

IPC: C08J03/12

CPC classification number: C08J3/12 ,  B29C41/003 ,  B29C64/153 ,  B29C67/04 ,  B29C2035/0838 ,  B29K2023/00 ,  B29K2023/06 ,  B29K2023/12 ,  B29K2059/00 ,  B29K2067/006 ,  B29K2077/00 ,  B29K2079/00 ,  B29K2995/0094 ,  B33Y10/00 ,  B33Y70/00 ,  C08J9/24 ,  Y10S521/919 ,  Y10S525/902 ,  Y10T428/249958 ,  Y10T428/249986 ,  Y10T428/252

Abstract: A laser-sinterable powder product has been prepared having unique properties which allow the powder to be sintered in a selective laser sintering machine to form a sintered part which is near-fully dense. For most purposes, the sintered part is indistinguishable from another part having the same dimensions made by isotropically molding the powder. In addition to being freely flowable at a temperature near its softening temperature, a useful powder is disclosed that has a two-tier distribution in which substantially no primary particles have an average diameter greater than 180 mu m, provided further that the number average ratio of particles smaller than 53 mu m is greater than 80 %, the remaining larger particles being in the size range from 53 mu m to 180 mu m. A powder with slow recrystallization rates, as evidenced by non-overlapping endothermic and exothermic peaks in their differential scanning calorimetry characteristics for scan rates of on the order of 10 DEG C to 20 DEG C per minute, will also result in sintered parts that are near-fully dense, with minimal dimensional distortion.

Abstract translation: 已经制备了具有独特性质的激光可烧结粉末产品，其允许粉末在选择性激光烧结机中烧结以形成接近完全致密的烧结部分。 对于大多数目的，烧结部分与通过各向同性地成型粉末制成的具有相同尺寸的另一部件是不可区分的。 除了在接近其软化温度的温度下可自由流动外，还公开了一种有用的粉末，其具有两层分布，其中基本上没有一次颗粒的平均直径大于180μm，条件是， 小于53μm的颗粒大于80％，剩余的较大颗粒的尺寸范围为53μm至180μm。 具有缓慢重结晶速率的粉末，其扫描速率在每分钟10℃到20℃的差示扫描量热法特征中不重叠的吸热和放热峰所证明的也将导致接近的烧结部件 非常密集，尺寸变形最小。