# US 4,393,014 A · Method of casting explosive charge with high solids content

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- Number: US 4,393,014 A
- Document ID: US4393014A
- Status: Granted
- Kind: A
- Application number: 06/302,946
- Filed: 1981-09-16
- Granted: 1983-07-12
- Earliest claimed: 1981-09-16
- Assignees: The United States of America as represented by the Secretary of the Army
- Inventors: George E. Ziegler
- Web page: https://patentgrep.com/patent/US4393014A

## CPC

- C06B 21/005: {By a process involving melting at least part of the ingredients}
- C06B: EXPLOSIVES OR THERMIC COMPOSITIONS (blasting F42D); MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES (compounds in general C01, C07 or C08; {demolition agents based on cementitious or like materials C04B41/0009})

## Abstract

A high solids content explosive charge is formed by placing the dry solids uch as RDX in a mold, adding TNT over the dry solids and holding the interior of the mold at an elevated temperature and reduced pressure to permit diffusion of the liquid TNT through the solids while the vacuum enhances the discharge of air from the mass. In one embodiment, a casing and liner of a shaped-charge warhead is employed for the mold and the TNT is placed in a funnel atop the casing. This assembly is placed inside a heated evacuated chamber for long enough to permit the liquid TNT to diffuse through the solid particles and for air to be discharged. In other embodiments, an air-tight casing is employed whose interior is evacuated while heating is performed.

## Claims

### Claim 1

A method of casting an explosive charge of trinitrotoluene containing a high percentage of solid particles insoluble therein in a mold comprising:
adding said solid particles to said mold;
adding an appropriate quantity of said trinitrotoluene to said mold over said solid particles;
heating said mold with said solid particles and said trinitrotoluene contained therein whereby said trinitrotoluene is liquefied and diffuses into said solid particles;
drawing a vacuum in said mold whereby release of air from said explosive charge is encouraged; and
continuing the heating and drawing steps simultaneously for a long enough time to complete the diffusion and air release.

### Claim 2 (depends on 1)

A method according to claim 1, wherein the steps of heating, drawing and continuing are performed by placing said mold containing said solid particles and said trinitrotoluene in a heated sealed chamber and evacuating air from said chamber.

### Claim 3 (depends on 2)

A method according to claim 2, wherein said mold includes a casing of a shaped-charge warhead having a conical liner closing one end thereof.

### Claim 4 (depends on 1)

A method according to claim 1, wherein said appropriate amount includes an amount exceeding the ability of said solid particles to absorb trinitrotoluene whereby a region of substantially pure trinitrotoluene is provided over a region of said solid particles with said trinitrotoluene diffused therethrough.

### Claim 5 (depends on 1)

A method according to claim 1, wherein said trinitrotoluene is added as flake trinitrotoluene.

### Claim 6 (depends on 1)

A method according to claim 1, wherein the step of heating includes contacting said mold with hot water.

### Claim 7 (depends on 1)

A method according to claim 1, wherein said mold includes a conical liner closing one end thereof and the step of heating includes heating an exterior surface of said conical liner.

### Claim 8 (depends on 7)

A method according to claim 7, wherein the step of heating an exterior surface includes contacting said exterior surface with a heated mandrel.

### Claim 9 (depends on 1)

A method according to claim 1, wherein said solid particles include particles of at least one of HMX and RDX.