Retort for improved thermal processing of sinterable objects

Patent metadata

Field	Value
Publication number	US-2023044534-A1
Application number	US-202217880050-A
Country	US
Kind code	A1
Filing date	Aug 3, 2022
Priority date	Aug 3, 2021
Publication date	Feb 9, 2023
Grant date	—

Abstract

A retort for thermally processing sinterable objects including a retort body having an interior cavity configured to receive at least one part for sintering. The retort body includes a retort inlet, a fore volume, an inlet plenum, an outlet plenum and a retort outlet. The retort inlet is configured to be fluidly connected to a process gas inlet tube and receive a flow of process gas. The retort inlet is fluidly connected to the fore volume, the fore volume being configured to receive a cleansing object. The fore volume is fluidly connected to the inlet plenum, which is fluidly connected to the interior cavity, which is in turn fluidly connected to the outlet plenum. The outlet plenum is fluidly connected to the retort outlet which is configured to be fluidly connected to an effluent gas outlet tube via a Peclet sealing element.

First claim

What is claimed:

1 . A retort for thermally processing sinterable objects, comprising:
a retort body having an interior cavity configured to receive at least one part for sintering; the retort body including a retort inlet and a retort outlet; wherein the retort inlet is configured to be fluidly connected to a process gas inlet tube and receive a flow of process gas; wherein the retort inlet is fluidly connected to the interior cavity; wherein the interior cavity is fluidly connected to the retort outlet; and wherein the retort outlet is configured to be fluidly connected to an effluent gas outlet tube via a Peclet sealing element.

2 . The retort of claim 1 wherein the retort body is formed from a base plate, a lid and a plurality of retort elements stacked therebetween.

3 . The retort of claim 2 wherein an outer layer of the retort body has a thickness selected such that a first permeation rate of contaminants through the outer layer is at least one order of magnitude less than a second permeation rate of contaminants between two of the plurality of stacked shelves.

4 . The retort of claim 1 wherein the Peclet sealing element extends into an outlet plenum from a wall of the retort outlet.

5 . The retort of claim 4 wherein the Peclet sealing element extends from the wall of the retort outlet towards the effluent gas outlet tube.

6 . The retort of claim 1 further comprising a fore volume shaped to facilitate the flow of the process gas from the process gas inlet tube over a cleansing object in a flow path to the interior cavity.

7 . The retort of claim 1 wherein the retort inlet includes a sealing element configured to engage an interior surface of the process gas inlet tube.

8 . A retort for thermally processing sinterable objects, comprising:
a base plate having a retort inlet and a retort outlet, the retort outlet incorporating a peclet sealing element, the base plate further having a fore volume; a plurality of shelf units successively stacked upon one another while a bottom-most one of the plurality of shelf units engages the base plate, wherein each shelf unit includes an inlet plenum region, an outlet plenum region and an interior cavity configured to receive an object to be sintered; wherein when successively stacked upon one another the inlet plenum regions of the shelf units form an inlet plenum and the outlet plenum regions of the shelf units form an outlet plenum; a top plate configured to engage with an upper-most one of the plurality shelf units; wherein when the base plate, the plurality of shelves and the top plate are assembled together to form a retort assembly, the retort assembly includes a process gas flow path through the retort inlet to the fore volume, from the fore volume to the inlet plenum, from the inlet plenum to the interior cavities of the plurality of shelf units, from the plurality of interior cavities to the plenum outlet and from the plenum outlet to the retort outlet through the Peclet sealing element.

10 . The retort of claim 9 wherein an outer layer of the retort assembly has a thickness selected such that a first permeation rate of contaminants through the outer layer is at least one order of magnitude less than a second permeation rate of contaminants between two of the plurality of shelf units.

11 . The retort of claim 9 wherein the Peclet sealing element extends into the outlet plenum from a wall of the retort outlet.

12 . The retort of claim 11 wherein the Peclet sealing element extends from the wall of the retort outlet towards an effluent gas outlet tube.

13 . The retort of claim 9 wherein the fore volume is shaped to facilitate the flow of the process gas from the process gas inlet tube over the cleansing object in a flow path to the inlet plenum.

14 . The retort of claim 9 wherein the retort inlet includes a sealing element configured to engage an interior surface of the process gas inlet tube.

15 . A method of thermally processing sinterable objects, comprising:
disposing an object in a retort having a retort inlet, an internal cavity and a retort outlet incorporating a Peclet sealing element; disposing the retort and in a furnace and conducting a thermal process within the retort; and providing a flow of process gas through the retort inlet, the internal cavity where the process gas interacts with object and exits through the Peclet sealing element of the retort outlet.

Assignees

• Desktop Metal Inc

Inventors

• Barbati Alexander

Classifications

• Y02P10/25

  Process efficiency · CPC title

• F27D2099/0078

  Means to minimize the leakage of the furnace atmosphere during charging or discharging · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• F27D99/0073

  Seals · CPC title

• B22F3/003 Primary

  Apparatus, e.g. furnaces (in general F27B) · CPC title