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A method for producing shaped articles of ceramic composites provides a high degree of dimensional tolerance to these articles. A fiber preform is disposed on a surface of a stable formed support, a surface of which is formed with a plurality of indentations, such as grooves, slots, or channels. Pre

A method for producing shaped articles of ceramic composites provides a high degree of dimensional tolerance to these articles. A fiber preform is disposed on a surface of a stable formed support, a surface of which is formed with a plurality of indentations, such as grooves, slots, or channels. Precursors of ceramic matrix materials are provided to the fiber preform to infiltrate from both sides of the fiber preform. The infiltration is conducted under vacuum at a temperature not much greater than a melting point of the precursors. The melt-infiltrated composite article substantially retains its dimension and shape throughout the fabrication process.

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A method for producing shaped articles of ceramic composites provides a high degree of dimensional tolerance to these articles. A fiber preform is disposed on a surface of a stable formed support, a surface of which is formed with a plurality of indentations, such as grooves, slots, or channels. Pre

A method for producing shaped articles of ceramic composites provides a high degree of dimensional tolerance to these articles. A fiber preform is disposed on a surface of a stable formed support, a surface of which is formed with a plurality of indentations, such as grooves, slots, or channels. Precursors of ceramic matrix materials are provided to the fiber preform to infiltrate from both sides of the fiber preform. The infiltration is conducted under vacuum at a temperature not much greater than a melting point of the precursors. The melt-infiltrated composite article substantially retains its dimension and shape throughout the fabrication process. material along a first plane which includes the centerline of the flow path of the material immediately before the first change in direction of the flow path and the centerline of the flow path of the material immediately after the first change in direction of the flow path, followed by a second change in direction of the flow path of the material, downstream of the first change in direction, which occurs in a direction which is not along the first plane. 3. A method of producing significantly balanced conditions of concentric laminates of a stream of laminar flowing material according to claim 1 wherein the repositioning of the dissimilar conditions of the lamninar flowing material in a circumferential direction occurs in each branch runner through a first change in direction of the flow path of the material along a first plane which includes the centerline of the flow path of the material immediately before the first change in direction of the flow path and the centerline of the flow path of the material immediately after the first change in direction of the flow path, followed by a second change in direction of the flow path of the material, downstream of the first change in direction, which occurs in a direction which is not along the first plane, and includes selecting flow angles at the first change in direction of the flow path and at the second change in direction of the flow path to cause a predetermined amount of repositioning to occur. 4. A method of producing significantly balanced conditions of concentric laminates of a stream of laminar flowing material according to claim I which includes repositioning the dissimilar conditions of the laminar flowing material of each runner of each pair of branch runners at a location of the runner system about where this pair of branch runners branches from a branching runner. 5. A method of producing significantly balanced conditions of concentric laminates of a stream of laminar flowing material according to claim 1 which includes repositioning the dissimilar conditions of the laminar flowing material of each runner of each pair of branch runners at a location of the runner system about where this pair of branch runners is joined to form a joint stream of material. 6. A method of producing significantly balanced conditions of concentric laminates of a stream of laminar flowing material according to claim 1 which includes repositioning the dissimilar conditions of the laminar flowing material of each runner of each pair of branch runners at a location in each branch runner which is between a location of the runner system where this pair of branch runners branch from a branching runner and a location in the runner system where this pair of branch runners is joined to form a joint stream of material. 7. A method of producing significantly balanced conditions of concentric laminates of a stream of laminar flowing material according to claim 1 in which the repositioning of the dissimilar conditions of the laminar flowing material occurs at more than one location with respect to each branch runner in at least one pair of branch runners. 8. A method of producing significantly balanced conditions of concentric laminates of a stream of laminar flowing material according to claim 1 in which the repositioning of dissimilar conditions of the laminar flowing material in one runner of each pair of branch runners occurs in a circumferential direction which is opposite from the circumferential direction in which the repositioning occurs in the other runner of this pair of branch runners. 9. A method of producing significantly balanced conditions of concentric laminates of a stream of laminar flowing material according to claim 1 in which the repositioning of dissimilar conditions of the laminar flowing material in one runner of each pair of branch runners occurs in a circumferential direction which is opposite from the circumferential direction in which the repositioning occurs in the other