Improved method for chromizing small parts

A kind of component, fragmented technology, applied in the field of diffusion coating applied to industrial parts, can solve the problems of ineffective, time-consuming, time-consuming, etc.

Inactive Publication Date: 2004-05-12
MCDERMOTT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The special measures used tend to be time consuming and not very effective as the parts usually move during the chromizing process and

Method used

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  • Improved method for chromizing small parts
  • Improved method for chromizing small parts
  • Improved method for chromizing small parts

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Embodiment Construction

[0040]The method of the present invention is to diffuse and coat one layer of high-concentration chromium layer on industrial quantities of ferrous scattered small parts (such as but not limited to screws, nuts, washers, fasteners, fittings, couplings, bolts, etc. or similar parts) ways to improve.

[0041] Referring to the accompanying drawings, first of all there needs to be a figure 1 with figure 2 Retort 10 is shown. A layer of refractory felt paper 30 is placed on the bottom of the retort 10. The refractory felt paper 30 may be of any type, such as FIBERFRAX from Unifrax Corporation  Ceramic fiber or KAOXOOL of Thermal Ceramics  Felt paper made of ceramic fibers. It can also be a thin layer of insulating batt.

[0042] Then, many small parts 20 (shown as an example with hexagonal nuts and straight pins among the figures) are placed on the felt paper 30, and these many irony parts and felt paper are regarded as one layer. Even though small parts may be in contact...

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Abstract

An improved process for chromizing commercial quantities of small, industrial, ferrous-based parts, such as but not limited to threaded connectors, pins, bolts, nuts, washers, fasteners, fittings, couplings, studs, etc., uses a retort filled with layers of parts coated with a chromium-containing slurry. The plurality of parts are arranged in layers on sheets of refractory felt paper and are heat treated simultaneously for causing the chromizing reaction between the slurry and the ferrous-based parts.

Description

technical field [0001] This invention relates generally to methods of applying diffusion coatings to industrial parts and, more particularly, to a new method for quickly and efficiently chromizing loose ferrous small industrial parts. Background technique [0002] Chromizing is a method of forming a chromium diffusion coating on ferrous parts in order to improve corrosion resistance, especially at high temperatures. Chromizing was developed and researched to provide a complete protective surface coating on parts subjected to extreme conditions, thereby prolonging their service life. [0003] Chromizing parts such as screws, bolts, and bolts is generally done by powder embedding metal infiltration. The method involves embedding the part in a dry powder mixture of alumina, chromium and salt activator in a retort, then sealing the bottle and heating it. During the heating process, the temperature of the retort is raised to a certain temperature and...

Claims

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Application Information

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IPC IPC(8): C23C10/18C23C10/32C23C26/00
CPCC23C10/32C23C26/00C23C10/18
Inventor D·D·齐格勒J·M·坦佐什W·R·莫恩
Owner MCDERMOTT TECH
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