Hello,
What are the manufacturing techniques for body armor product. and silicon carbide ceramic tiles with 10mm are good enough are not for type 4 body armor. If it's good which materials is good as a backing material of silicon carbide?
dear pramod
read this link
https://www.ncjrs.gov/pdffiles1/nij/183652.pdf
best regard
Dear Dr. Pramod
There are many polymeric and composite materials are good for body armor. Please, find current attachment.
Dear Pramod,
The composites used in ballistic are mainly manufactured with the following fibers:
E glass
Dear Pramod, you need to formulate your questions more correct and accurate. This is the first step to clear understanding any issue...
I am trying for developing level 4 body armor with silicon carbide and frp backing material. For this which manufacturing technology will be suitable and how much thickness of both ceramic and frp is good enough for level 4. I know compression molding and contact molding. I am thinking for vacuum infusion is this possible for these type of materials?
Dear Pramod,
A simple way is to use a 2 steps method to combine the SiC ceramic with a composite backing :
First step will be to realize the laminate for the backing of your SiC ceramic.
As I already told you in my previous answer for this threat level only UHMWPE or aramid can be considered and if I had to choose, I would go for UHMWPE due to the fact that here the main problem will be the weight compared to the lower threat levels where flexibility and stab resistance will be two additional and requested parameters.
Anyway the best way to do a UHMWPE or aramid based laminate will be to use the compression technology.
The available UHMWPE, is currently an UD sheet with a polyurethane matrix. To press several layers together you will need a high pressure (HP) press. To obtain the best ballistic performance for the UHMWPE it will be necessary to press at a HP of at least 150 kg/cm² (2133 psi). Below this pressure, the ballistic performance of the laminate will be lower.
Concerning the aramid, the best ballistic performance will be with a phenolic matrix for this threat level and you can also use the compression technology to manufacture a laminate with several layers of aramid prepreg but this time with a more standard HP of about 30 Kg/m² (427 psi). A low pressure (3-5 kg/m²) will also diminish the ballistic performance of the aramid laminate.
The second step consist to glue together the SiC ceramic tiles and backing .This step can be done in an autoclave or with a simple vacuum bag.
The compression technology is not so suitable but works also at low pressure. The risk is that the SiC ceramic tiles deviate from each other if you don’t take care, where the vacuum technologies will keep them together.
Best regards
Dear Dominique,
thank you for your feedback.
If i wil try with S2 glass and epoxy resin. how it can works for ballistic materials.
High energy absorption and low density are the main considerations. Spectra, Dyneema and Aramid are the main materials used in various forms.
Greetings.
Silicon Nitride (Si3N4) nanoparticles have shown very good performance in increasing resistance to crack growth in resin based composite materials. Nanodiamonds or graphene are also very promising in this field. NIJ Level IV protection involves stopping a projectile 7.62x51 AP and to achieve that, an strike layer of 15 mm of monolithic silicon carbide (SiC) will be necessary to fragment the projectile and another 15 mm of a carbon fiber reinforced epoxy resin composite to absorb impact energy and stop the fragments.
Any real body armour is not a material, but... a construction! I am afraid that some people involved in the discussion here are not aware of this fact... Sorry...
No comment about Si3N4, but carbon fibre reinforced epoxy would not be a good backing material, since the fibres are too brittle. Kevlar, Dyneema or Spectra reinforced plastic would be able to absorb and disseminate much more energy, and even a good light alloy metal should be superior as backing to the C-fibre material! And I fully agree with the comment by Dr. Shabalin!
From my personal professional experience obtained in this area, I am aware of the fact that the best ceramics for body armour constructions is a cellular ceramics filled with polymers... So, in my opinion, the discussion here is going wrong way!
From my experience, front material has high tensile modulus showing better compression, And, back material has rigid thougened resin/multiaxis 3D artitectural woven para-aramid filled in the interface with nano carbon sphere.
Best regards,
Kadir Bilisik
S2 glass fibres might be one of the good options as reinforcement if considering polymeric composites as backing materials. However, the weight is an issue.
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