Braze methods and components with heat resistant materials

A braze method for a turbine shroud onto a substrate, the method comprising:

• providing a substrate comprising a pre-sintered preform disposed thereon, the substrate comprising a plurality of Z-notches, a plurality of Z-notch contact surfaces and a plurality of non-Z-notch contact surfaces, the plurality of non-z-notch contact surfaces comprising one or more seal rails, wherein the pre-sintered preform comprises a mixture comprising a base alloy comprising about 30 weight percent to about 90 weight percent of the mixture and a second alloy comprising a sufficient amount of melting point depressant to have a lower melting temperature than the base alloy, the pre-sintered preform comprising a shape matching the plurality of non-z-notch contact surfaces and the one or more seal rails;
• at least partially covering the pre-sintered preform with a heat resistant material, wherein a melt temperature of the heat resistant material is higher than a melt temperature of the pre-sintered preform, the heat resistant material reducing dimensional instability of the pre-sintered preform during subsequent heat applications of pre-sintered preform;
• and,
• heating the pre-sintered preform on the substrate.