| 摘要 |
<p>A combustion engine with heat-stressed parts has a porous heat-insulating layer applied to these parts. The heat-insulating layer formed from grains and/or fibres bonded to one another on the outside is produced at least partially from a heat-resistant and abrasion-proof insulating material having stability under thermal shocks. The heat-insulating layer has a heat penetration coefficient defined by the following formula b = * radical ** small Greek rho * * solidtriangle; up triangle filled* C * solidtriangle; up triangle filled* * small Greek lambda * with b: the heat penetration coefficient of the heat-insulating layer in [J* solidtriangle; up triangle filled*(Kcmé * radical *s) -1 ], * small Greek rho *: the density of the heat-insulating layer in [g/cm 3 ], * small Greek lambda *: the thermal conductivity of the insulating material in [W/cmK] C: the specific heat of the insulating material in [J/gK], the said heat penetration coefficient being lower than 0.25 [J* solidtriangle; up triangle filled*(Kcm 2* radical *s) -1 ]. Furthermore, the total porosity of the heat-insulating layer (1) is higher than 20%, and therefore grains (2) and/or fibres which are hollow are used for the application of the heat-insulating layer.</p> |
