Concept

In order to develop a green solid propellant AP must be replaced with a chlorine free solid oxidizer. Unfortunately the number of oxidizers is very limited and only two useful green oxidizers exist:

 

● Ammonium nitrate, AN (NH4NO3)
● Ammonium dinitramide, ADN (NH4N(NO2)2)

 

both having their respective pros and cons.

 

AN is a very cheap oxidizer, mainly used as fertilizer. Propellants based on AN have low performance and low burning rate and thus AN based propellants have mainly been used in low performance applications such as gas generators.

 

ADN is a new oxidizer still in the development phase. It provides very high performance and high burning rate, but is more costly and more explosively hazardous compared to AP.

 

In the table below some of the properties of ADN and AN are presented qualitatively in relation to AP.

 

Property

AN

ADN

Performance (Isp)

Low

High

Burning rate

Low

High

Explosive hazard

Low

High

Cost

Low

High

Environmental impact

Low

Low

It can be seen that neither AN, nor ADN are able to replace AP. However, by combining the two, bringing the best of each, the properties can be tuned to meet, or even exceed, the properties of AP.

 

The research in the project will to a large extent build on the experience gained in the EU FP7 project HISPexternal link, opens in new window.

Coordinator:

FOI, Swedish Defence Research Agency
Department of Energetic Materials
Grindsjön Research Centre
SE-147 25 Tumba

 

SWEDEN

Contact:

Niklas Wingborg
Tel : +46 8 5550 4181
Mobile: +46 709 277378
Fax : +46 8 5550 3949
Email: niklas.wingborg@foi.se

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 638719.