Patent DE-102009008685-A1 (DE)
Title: Producing component such as connection sleeve for brake disk of motor vehicle by injection-molding, comprises mixing metal- and/or ceramic powder with binder to homogeneous mass, and subsequently producing molded body from homogeneous mass
Inventor: RENZ RALPH
IPC: B22F1/10
Filed: 2009-02-06
Abstract: The method comprises mixing a metal powder (11) and/or ceramic powder with a binder (12) to a homogeneous mass (10), subsequently producing a molded body (14) from the homogeneous mass by injection-molding (13), consequently subjecting the molded body to a de-binding process, and solidifying the molded body to the component with desired geometrical properties by sintering in connection to the de-binding. The homogeneous mass comprises 3-25 mass% of binder and 75-97 mass% of metal powder and/or ceramic powder as ingredients. The binder comprises plasticizer (50-75 mass%). The method comprises mixing a metal powder (11) and/or ceramic powder with a binder (12) to a homogeneous mass (10), subsequently producing a molded body (14) from the homogeneous mass by injection-molding (13), consequently subjecting the molded body to a de-binding process, and solidifying the molded body to the component with desired geometrical properties by sintering in connection to the de-binding. The homogeneous mass comprises 3-25 mass% of binder and 75-97 mass% of metal powder and/or ceramic powder as ingredients. The binder comprises plasticizer (50-75 mass%), polyamide and/or polyacrylate (15-35 mass%) and tenside (10-15 mass%) as ingredients. The de-binding process thermally and chemically takes place at first and then together with the sintering process. During chemical de-binding under the use of a solvent, a first constant temperature is initially adjusted for a first time period, subsequently the temperature of the first temperature is linearly increased to a second temperature during a second time period and consequently the second temperature is kept in constant for a third time period, where the first temperature is 20[deg] C+- 30[deg] C, the first time period is 5+- 0.5 seconds, the second temperature is 45[deg] C+- 2[deg] C, the second time period is 5+- 0.5 hours and the third time period is 5+- 0.5 hours. The sintering process takes place together with the thermal de-binding process in a protective gas atmosphere or under vacuum, so that the temperature is multiply increased and subsequently kept in constant, where the temperature is again reduced to room temperature after reaching a maximum temperature, which is 1230-1250[deg] C. The temperature originating from a room temperature is increased to the first temperature of 330[deg] C+- 20[deg] C and is subsequently kept constant for the first time period of 120+- 30 minutes, the temperature originating from the first temperature is increased to the second temperature of 420[deg] C+- 10[deg] C and is subsequently kept constant for the second time period of 120+- 30 minutes, and then the temperature originating from the second temperature is increased to a third temperature of 580[deg] C+- 5[deg] C and is subsequently kept constant for the third time period of 120+- 30 minutes. The third temperature is increased to the maximum temperature and is again reduced to the room temperature after reaching the maximum temperature. The increasing and constantly keeping of the temperature is repeated up to reaching the maximum temperature, where in each case, the constantly held temperatures are present in respective individual time periods. The temperature originating from the room temperature to the first temperature, originating from the first temperature to the second temperature and originating from the second temperature to the third temperature is linearly increased over a time period of 60+- 15 minutes with temperature gradients. The temperature originating from the third temperature is linearly increased to the maximum temperature in direct successive steps with individual temperature gradients. The protective gas is argon or a pressure of less than 104 bar is adjusted in vacuum. A vacuum drying takes place between the chemical de-binding process and the thermal de-binding process with the pressure of less than 0.1 bar. Independent claims are included for: (1) a connection sleeve for a brake disk; and (2) a brake disk.