Intro to Additive Manufacturing:
Materials & Performance
Materials are the lifeblood of additive manufacturing. Oftentimes referred to as consumables, the advancements in 3D printing materials have been extraordinary with no signs of slowing down. Material developments are driven by the demand for stronger and specific solutions that lead to new applications. Chemical resistant thermoplastics used for the oil & gas industry, high performance nylons used as a substitute for short-run production, and impossible to produce metal printed parts that are complex and perfect for end-use assemblies in aerospace. As mentioned in previous chapters, the book of additive manufacturing continues to evolve and every technology, process and material is becoming a viable solution somewhere, for someone. Forbes published a recent survey conducted with 1,300 respondents across North America and Europe that demonstrates significant increases from 2015-2019 for additive applications—specifically production, spare parts and R&D.
The Complexity of Consumables
The beauty of 3D printing is also the beast that plagues many design and production engineers. The world of additive materials is vast; however, it’s important to remember that a singular technology or process will not be compatible with every material available. For example, one artist wishes to use watercolors and requires a round brush and a specific canvas. The other desires to paint a variety of surfaces—justifying a more versatile material, such as acrylic. It becomes quite challenging to understand the complexity of the consumable market in additive manufacturing and the compatibility with different technologies. The Pyramid of Performance was created by our staff of subject matter experts to showcase the realm of possibilities 3D printing offers. In addition, all of these materials are available at Forecast3D.
AM Materials Foundation
Beginning with the basic foundation of the most widely used and adopted thermoplastics, we start to understand how and why these materials are used for functional prototypes and design validation practices. Within this particular segment of the pyramid we identify the materials in two different categories, (1) ABS plastics and (2) simulation rigid materials. Depending on your application and strength requirements, these materials are often used to replicate the real product. However, for those who wish to evaluate their designs, check form, fit and function, or who see this as an opportunity to share highly aesthetic parts for feedback sessions with colleagues or clients—these are cost effective and ideal materials.
ABS Plastic is the most widely used material in additive and traditional manufacturing. Commonly used as an injected molded material for countless industries, it’s no surprise that this material has become ideal for product designers and prototype developers. There are several variations of ABS plastic offered at GKN Additive (Forecast 3D) that vary in structural properties and aesthetics. For example, ABS - M30 offers increased strength capabilities equipping engineers with a low-cost solution ideal for concept modeling and manufacturing tools. Finally, ASA is an advanced version of ABS plastic that boasts exceptional UV resistance characteristics, making it an ideal material for outdoor products and applications.
Simulation Rigid Materials
Why simulate rigid materials when you can simply print ABS plastic instead? ABS printed plastic is predominantly available on FDM and FFF printers which, due to their printing process, may not have the required aesthetics your team requires for product validation, feedback or focus group sessions. Therefore, SLA and PolyJet technology offers an array of materials that are not as structurally sound as ABS plastic, but do provide exceptional finish quality that are ideal for visual applications. In our experience, it’s the perfect material option for client feedback sessions and upper management discussions, and is an exceptional resource for marketing to build their promotional campaigns with early product images or physical demonstrations at trade events.
So what works for your application, SLA or PolyJet? Both are thermoset polymers that offer high resolution parts with smooth, injection mold-like finishes. Here is a quick breakdown:
- SLA 11122 XC Watershed is a water-resistant material that mimics ABS plastic quality and is one of the clearest materials available on the market. Ideal for medical and consumer product applications.
- SLA NeXt offers a new generation of material that facilitates the production of tough, complex parts with improved moisture resistance and improved thermal properties.
- PolyJet Vero prints in 16 micron details and is available in several different color palettes. This technology is ideal for the fabrication of complex assemblies.
- PolyJet Rigur is an improved photopolymer that simulates polypropylene and is ideal for flexible closures or living hinges.
Specialty Materials & Flexibles
Moving up the pyramid or materials indicates an increase in strength or capability. This particular segment identifies two distinct categories of additive materials, (1) specialty materials, and (2) flexibles. While the additive manufacturing market has exploded with different versions of plastics and simulation materials, so has the demand for materials that solve niche applications. This section is dedicated to understanding how, and why, these materials are being used in the marketplace today.
There are several materials within this segment that have been implemented across various industries to solve unique problems. Most notably, materials developed for medical and industrial tooling applications have expanded within the past decade. It’s important to remember that each material presented belongs to a specific technology, and it is rare that a facility will have access to this wide array of capabilities.
The first medical material, ABS - M30i is biocompatible (ISO 10993 USP Class VI) and typically used within the medical, pharmaceutical, and food packaging industries. The second biocompatible material available is Med610, operational under the PolyJet umbrella, which is approved for cytotoxicity, genotoxicity, delayed type hypersensitivity, irritation and USP plastic class VI. Skin contact is approved for up to 30 days, making it ideal for hearing aids, prosthetics and orthotic applications.
When it comes to tooling for manufacturing applications, there are two materials available that make a world of difference as it relates to time and money for engineers. First, ST-130 belongs to the FDM family and is used primarily to build sacrificial tools enabling the production of hollow composite parts. This material can withstand the heat and pressure of autoclave curing and has become quite the resource for engineers designing highly complex parts. Second, PerForm is a ceramic-based SLA material that has the lowest viscosity of any stereolithography material with excellent detail resolution, outstanding stiffness, and superior high heat tolerance. Ideal for tooling, wind tunnel testing and high temperature testing.
The ability to 3D print soft-touch parts is a distinct advantage for consumer product, automotive, and medical device designers. Thermoplastic polyurethane (TPU) is a class of polyurethane plastics with many properties, including estaticity and transparency, and is resistant to oil, grease and abrasion. There are different versions of TPU offered within the additive market, and it’s valuable to understand which materials belong to their respective technology.
- FDM TPU 92A is durable, elastic material that boasts high elongation, superior toughness and durability. 92A represents the Shore A value of 92, indicating its flexibility and further justifying its use for prototyping flexible hoses, tubers, air ducts, and vibration dampeners.
- MJF Estane 3D TPU is a flexible material produced through a joint collaboration between HP and one of the most well-known chemical companies on the planet, Lubrizol. Known for developing industrial grade materials, Lubrizol stands behind the versatility of this material. It’s often used for end-use parts that require high tear strength and rubber-like flexibility.
- MJF TPU 88A BASF Ultrasint is another material born from the collaboration with major industry leaders. This time, BASF offers a high wear/abrasion resistant material that is an excellent choice for shock absorption applications. Lauded as a material that provides high accuracy, detail and smooth surface finishes.
- PolyJet Agilus30 is a Shore A value thermoset material that is traditionally used to build durable, tear-resistant prototypes that can withstand repeated flexing and bending. It’s the only flexible material on the market capable of achieving a clear and transparent finish.
Advanced Thermoplastics For Production
The current demand for materials that solve production, spare part, and R&D applications have grown year-over-year for the past five years with no signs of slowing down. Airbus implemented additive manufacturing to produce non-load bearing, cabin interior components that have enabled the company to significantly cut down on weight, reducing gasoline expenditures. In 2018, American automotive manufacturer, Ford, opened a 135,000 square foot Advanced Manufacturing Center in Michigan to be the go-to facility for all things 3D printing. Even the injection molding industry has been impacted with the ability to 3D print cost effective injection mold tools for short run production applications. It’s become quite obvious that 3D printing has become a viable solution for manufacturers due to the advancements in the following materials.
Nylon is considered one of the most versatile materials used in the marketplace for applications that require high tear strength capabilities, and can withstand considerable abuse. As a member of the thermoplastic family, Nylon is a semi-crystalline plastic that has amorphous and crystalline properties. Due to the unique strength characteristics, Nylon has been widely adopted across several different additive technologies and therefore, available in many forms. Speak with an engineering expert today to determine which works for your application.
High Performance Thermoplastics
Complementary to the vast family of Nylon materials offered at GKN Additive (Forecast 3D), there are additional thermoplastics that have become quite popular within the automotive, aerospace and industrial manufacturing markets. Once upon a time, it was very difficult for industry leaders to adopt 3D printing as a viable alternative for production. That has changed significantly within the past decade. Scientists, researchers and major industry leaders have collaborated to standardize and approve the following materials.
- Polycarbonate is one of the most underrated materials available for manufacturing aids, tooling, jigs and fixtures. With a flexural strength of 15,100 psi and high tensile strength properties, it’s no surprise that 3D printing with polycarbonate (PC) is common for manufacturing facilities. This material can withstand the abuse that parts receive on the assembly line, and is a much more cost effective option when compared to CNC metal processes and parts.
- ULTEM9085 is a widely adopted material within the transportation industry due to its high strength-to-weight ratio and FST (flame, smoke, and toxicity) rating. Boeing, Airbus, Lockheed Martin, L3-Harris and many other major aerospace companies have integrated this material as a proven alternative to aluminum or metal parts used on their products. Thanks to the inherent value of additive manufacturing to design complex, hollow and honeycomb internal structures, companies are reducing weight and increasing opportunities to create custom solutions.
- ULTEM1010 is arguably one of the most promising materials when it comes to high temperature and chemical resistant applications. With similar strength properties as its predecessor, ULTEM9085, ULTEM1010 boasts a heat deflection temperature of 421°F making it ideal for under-the-hood applications. In addition, its impressive HDT characteristics makes it perfect for autoclave applications which bodes well for sterizable medical devices and biocompatible requirements within the food packaging industry.
Strength, Performance & Possibilities: Additive Metal Manufacturing
Additive metal manufacturing is not new, but the recent developments in materials and capabilities have made the possibilities endless. Estimated to be a $2 billion market, the AM metals industry is expected to triple within the next few years, potentially exceeding $7 billion by 2024. Led primarily by the early adopters in the aerospace and medical fields, metal AM is without a doubt an industry that is worth keeping an eye on. In addition, metal AM is disrupting traditional supply chains and major MRO and spare part suppliers are taking notice. In 2018, the third largest aerospace MRO provider, Lufthansa Technik, signed an agreement with Oerlikon to accelerate additive manufacturing processes for MRO applications. Below are the metal materials offered by GKN Additive (Forecast 3D), their characteristics, and where we see the most opportune scenarios for growth and application.
- SLM Aluminum - ALSI 10 MG is a low density material with good alloying properties. Commonly recognized across many industries, aluminum provides consistent processability for casting and pressing applications, which makes it popular for many manufacturers in the automotive, aerospace, and consumer goods markets.
- SLM Stainless Steel 17-4 has become an ideal material for prototype and small series production runs in the medical and aerospace verticals. Regarded as a durable and corrosion resistant material, it’s commonly found in a variety of industries.
- SLM Stainless Steel - 316L boasts great hardness combined with good durability characteristics. Regarded as a material with excellent weldability, it’s become quite common for automotive and maritime applications. In addition, it’s an ideal material for injection and pressure die casting molds.
- SLM Inconel 625 & 718 is the material of choice for the majority of aircraft engine components with service temperatures below 1200°F. This alloy has excellent creep-rupture strength and is a viable option for tool & die applications.
- SLM Cobalt-Chrome alloys are standard alloys in the medical and dental fields. Due to its biocompatible characteristics, this material is oftentimes used for knee, hip and joint implants.
- SLM Titanium - TIAL6V4 is a high strength, low density material that is used in a plethora of applications and industries. From aerospace to medical and maritime to jewelry design, titanium 3D printing has become quite popular.
Disclaimer: This is not the complete list of all additive materials available in the marketplace today. There are many variations of different thermoplastics, thermosets and metals that are still being developed. Forecast3D has over 25 years of experience within the AM market and has compiled, what we consider, the most complete material offering possible. Our complementary technologies enable our clients to solve the most difficult challenges with proven, successful and certified materials.
70% of enterprises will identify new applications for 3D printing in the coming year while 60% plan to investigate new materials.
Over 70% of respondents in North America suggest that 3D printing will have a significant role in manufacturing, business and individual life.