Corundum Molds for Investment Casting from Refractory Alloys and Metals

Table 4

Relationship between ALUMOX-based shell mold mechanical properties and activator amount.

ASD-4 amount, wt. %	5	7	10	12
Liquid : Solid : ASD-4	25 : 70 : 5	25 : 68 : 7	25 : 65 : 10	25 : 63 : 12
Amount of layers	6 layers completely, 7 ones without dusting
𝜎bend. of dry sample, MPa	2.2	2.4	2.7	3.0
𝜎bend. of calcined samples at 1250^∘C, MPa	7.0	7.4	9.4	14.1
𝜎bend. of calcined samples at 1350^∘C, MPa	11.8	15.5	20.5	19.2