Back to results
US 4,362,471 AGranted
Article, such as a turbine rotor and blade which comprises a first zone of a nonoxide ceramic material and a second zone of a softer material
AssigneeVolkswagenwerk Aktiengesellschaft
InventorsManfred Langer, Johann Siebels
Life of this patent
Estimating the term…
Abstract
The method produces an article which has a first zone comprising a nonoxide ceramic material (which materials cannot be soldered or welded) and a second zone comprising a different, softer material such as one which can be soldered or welded to other parts. A transition layer between the zones of the article comprises both materials for bonding the zones together. The method forms the article from powders with heat and pressure.
Claims14
An article, such as a turbine rotor and blade, which comprises a first zone of a nonoxide ceramic material;
- a second zone of a different, softer material which can be soldered or welded;
- and a transition region between said zones which bonds said zones together;
- wherein said transition region comprises intermingled materials of the first and second zones, which article is formed from two powders, the first powder being capable of forming said nonoxide ceramic material and the second powder being selected from the group consisting of Al.sub.2 O.sub.3, 52% Cu-35% Cr-13% Ni, 35% Cu-15% Cr-50% Ni, Co-Ni-Fe compounds, Co-Ni-Fe-Mo compounds, transition metals, and transition metal compounds, which powders are introduced into respective portions of a mold corresponding to said first and second zones, are mingled to form said transition region, and are molded together at least by the application of pressure to form a solid article.
An article, such as a turbine rotor and blade, which comprises a first zone of a nonoxide ceramic material;
- a second zone of a different, softer material which can be soldered or welded;
- and a transition region between said zones which bonds said zones together;
- wherein said transition region comprises intermingled materials of the first and second zones, which article is formed from two powders, the first powder being a nonoxide ceramic material and the second powder being said different material, which are introduced into respective portions of a mold corresponding to said first and second zones, which are mingled to form said transition region, and which are molded together by hot molding to form a solid article and wherein particles from a third material are introduced in the transition region capable of forming a solid compound with a gas liberated from one of the other materials by the heat generated by the hot molding step and being selected from the group consisting of Al, Mo, and B, to substantially prevent the formation of gas bubbles which the gas would otherwise have formed in the transition region.
An article, such as a turbine rotor and blade, which comprises a first zone of a nonoxide ceramic material;
- a second zone of a different, softer material which can be soldered or welded;
- and a transition region between said zones which bonds said zones together;
- wherein said transition region comprises intermingled materials of the first and second zones, which article is formed from two powders, the first powder being a nonoxide ceramic material and the second powder being said different material, which are introduced into respective portions of a mold corresponding to said first and second zones, which are mingled to form said transition region, and which are molded together by hot molding to form a solid article and wherein said second powder is capable of forming a solid compound with a gas liberated from the nonoxide ceramic material by the heat generated by the hot molding step, thereby substantially preventing the formation of gas bubbles which the gas would otherwise have formed in the article.
An article, such as a turbine rotor and blade, which comprises a first zone of a nonoxide ceramic material;
- a second zone of a different, softer material which can be soldered or welded;
- and a transition region between said zones which bonds said zones together;
- wherein said transition region comprises intermingled materials of the first and second zones, which article is formed from two powders, the first powder being a nonoxide ceramic material and the second powder being said different material, which are introduced into respective portions of a mold corresponding to said first and second zones, which are mingled to form said transition region, and which are molded together by hot molding to form a solid article and wherein the nonoxide ceramic material is Si.sub.3 N.sub.4 and said second powder is a silicide or nitride former.
An article, such as a turbine rotor and blade, which comprises a first zone of a nonoxide ceramic material;
- a second zone of a different, softer material which can be soldered or welded;
- and a transition region between said zones which bonds said zones together;
- wherein said transition region comprises intermingled materials of the first and second zones, which article is formed from two powders, the first powder being capable of forming said nonoxide ceramic material and the second powder being said different material, which are introduced into respective portions of a mold corresponding to said first and second zones, which are mingled to form said transition region, and which are molded together at least by the application of pressure to form a solid article and wherein the molding process is carried out by cold molding and said first powder is a Si material capable of forming nonoxide ceramic material upon further treatment, and wherein said first powder and the mingled first and second powders are treated with heat in a gas atmosphere, after they have been cold molded, to form the first zone of a nonoxide ceramic material and the transition region.
Dependencies are inferred from the claim text.