Method for 3-D printing a pattern for the surface of a turbine shroud

摘要

A method of making an article of manufacture is provided and includes the steps of spraying a first coating onto a substrate, and depositing a second coating on the first coating by 3-D printing a material disposed in a pattern. The pattern includes ridges disposed at a base surface of a turbine part. Each ridge defined by first and second sidewalls, each sidewall having a first and second end. The ends extend from the base surface, the sidewalls slope toward each other until meeting at second ends of respective first and second sidewalls defining a centerline and a top portion of the ridge. The sidewalls are inclined with substantially equal but opposite slopes with respect to the base surface. The ridges correspond to a back portion of a turbine bucket and are oriented at a first angle with respect to an axis of rotation of the bucket.

主权项

1. A method of making a turbine part, the method comprising:
spraying a first coating onto the turbine part; 3-D printing a second coating material disposed in a pattern onto the first coating, wherein the pattern comprises:
a first plurality of ridges disposed at a base surface of the turbine part,each ridge of the first plurality of ridges defined by a first sidewall and a second sidewall, the first and second sidewalls each having a first end and an opposite second end, the first end of the first and second sidewalls extending from the base surface of the turbine part, the first and second sidewalls sloping toward each other until meeting at the second ends of respective first and second sidewalls defining a centerline and a top portion of the ridge, the first and second sidewalls inclining with substantially equal but opposite slopes with respect to the base surface of the turbine part; wherein at least a first portion of the first plurality of ridges corresponding to at least a back portion of a turbine bucket is oriented at a first angle with respect to an axis of rotation of the turbine bucket; wherein the first angle ranges from about 20 degrees to about 70 degrees; wherein the pattern includes the first plurality of ridges disposed at the base surface of the turbine part such that each ridge of the first plurality of ridges are substantially parallel to each other; and wherein the first angle is equal to an exit angle of a trailing edge of the turbine bucket.