Collimators/Anti scatter grids

ADVANTAGES

Collimators, or anti-scatter grids, are critical components for radiation management in computerized tomography (CT) scanning. They are typically manufactured using dense refractory metals and alloys such as tungsten (W) and tungsten heavy alloy (WHA) due to the materials’ superb attenuation characteristics for X-radiation – the chief wavelength range used to generate detailed CT scans.

APPLICATION

Radiation Management

MARKET SEGMENT

Medical, Additive Manufacturing

MATERIALS

Mo, W, WHA, WCu

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Please fill in the boxes on the contact form and a member of the team will contact you directly for a quotation.

Each quotation will be unique to the customer requirements so please give as much information in the contact form as possible, this will enable us to get the most accurate price back to you.


With unmatched experience in the fabrication of high-technology parts using refractory metals and alloys, like tungsten and molybdenum (Mo), H.C. Starck Solutions can reliably produce and supply collimators for radiation management in CT scanners and radiotherapy applications.

Collimators for Radiation Management

Collimators manage radiation by either focusing an X-ray source into a manageable, parallel beam of rays that is directed onto an area of interest, or by absorbing scattered rays before they enter photodetectors. Lead (Pb) and depleted uranium have been used in the past, but tungsten has emerged as the ideal replacement for multi-leaf collimators in radiation therapy beam focusing and detector plates in CT scanners for a number of reasons.

Tungsten is a remarkable metal with a notably high density (~19.3g/cm3), which makes it suited for radiation shielding in complex medical apparatuses. It is widely used in the medical diagnostics market to fabricate collimators for both beam focusing and CT scanner assemblies. The outstanding mechanical properties complicate its workability, however, and the fabrication of multi-leaf tungsten collimators requires significant experience in precision machining and tolerancing of refractory metal parts.  

H.C. Starck Solutions fabricated products and services are routinely supplied as robust solutions for intricate challenges in the medical technology sector. With high capability inspection equipment and unmatched expertise in working dense metals like tungsten, H.C. Starck Solutions has emerged as one of the leading suppliers of collimators for CT scanning and radiotherapy applications. All fabricated components can be rapidly and reliably finished, with a contact-free quality assurance and control process guaranteeing components are form fit with a resolution of approximately 0.1 – 1 micrometer (μm).

If you would like more information about H.C. Starck Solutions collimators, please do not hesitate to contact the team today.

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Balance Weights

ADVANTAGES

High density means more weight in less space. WHA 60% more dense than lead.

APPLICATION

Balance & Vibration Control

MARKET SEGMENT

Aerospace & Defense, Industrial Processing

MATERIALS

WHA

REQUEST A QUOTE

Please fill in the boxes on the contact form and a member of the team will contact you directly for a quotation.

Each quotation will be unique to the customer requirements so please give as much information in the contact form as possible, this will enable us to get the most accurate price back to you.


 

Tungsten Balance Weights

H.C. Starck Solutions, a worldwide manufacturer of tungsten balance weights made of technology metals , provides high performance solutions to customers in the aviation industry. Technology metals like tungsten alloys have been the choice material for machined and fabricated products in critical aerospace applications.

Our machineable high-density tungsten alloys, with a density over 60 % higher than lead, help stabilize helicopter rotor blades and the control surfaces of ailerons, elevators, and rudder sections:

  • Aircraft and Helicopter Tungsten Balance Weights
  • Instrumentation Tungsten Balance Weights
  • Vibration Dampening Tungsten Weights

Produced and Certified to AMS-T-21024, AMS 7725 and ASTM B777.

Customer Collaboration with Tighter Process Controls

As a vertically integrated manufacturer, we exercise tight control of all our processes from refining the raw materials to delivering high purity finished products. H.C. Starck Solutions has a unique global reach allowing for close contact and collaboration with our customers. Our experienced Research and Development department allows us to constantly be at the forefront of technological advancement and development of new products together with our partners in the industry.

H.C. Starck Solutions supplies the following tungsten alloys:

Kulite® and HPM Tungsten Alloys

H.C. Starck Solutions supplies the long established Kulite® tungsten alloys from the U.S. (Table 1) and HPM tungsten alloys from Germany (Table 2).

Table 1 – Kulite® tungsten alloys (K1700 thru K1850)

Alloy Designation K1700 K1701 K1750 K1800 K1801 K1850
Tungsten content (%) 90 90 92.5 95 95 97
Density (g/cm3) 17 17 17.5 18 18 18.5
(lb/in3) 0.61 0.61 0.63 0.65 0.65 0.67
Hardness (Rc) 23 22 24 25 24 26
Ultimate Tensile Strength (psi) 125,000 110,000 125,000 125,000 110,000 120,000
(N/mm2) 860 760 860 860 760 830
Yield Strength (psi) 85,000 80,000 90,000 90,000 85,000 95,000
(N/mm2) 590 550 620 620 590 660
Elongation % 12 4 10 8 2 6
Modulus of Elasticity (psi x 106) 45 40 46 48 45 50
(kN/mm2) 310 280 320 330 310 345
Magnetic Properties slight none slight slight none slight
Magnetic Permeability (µ) >1.05 <1.05 >1.05 >1.05 >1.05 <1.05
Thermal Expansion Coefficient (x 10-6/K)
(20 °C – 500 °C)
5.1 5.4 4.9 4.8 5.0 4.8
Thermal Conductivity (cgs) .20 .23 .24 .27 .32 .26
Electrical Conductivity (% IACS) 11 14 12 15 16 16
MIL-T-21014(D) class 1 1 2 3 3 4
ASTM B777 class 1 1 2 3 3 4

Table 2 – HPM tungsten alloys

Typical properties of tungsten composite materials

Inspection
criterion
HPM
1700
HPM
1710
HPM
1701
HPM
1705
HPM
1750
HPM
1750
sheet
Tungsten content % 90.0 90.0 90.0 90.0 92.5 92.5
Density g/cm³ 17.0 ± 0.2 17.0 ± 0.2 17.0 ± 0.2 17.3 ± 0.2 17.5 ± 0.2 17.6 ± 0.2
Hardness HV 30 ≤ 320 ≤ 320 ≤ 320 ≤ 360 ≤ 325 ≤ 460
Tensile strength
(typical value)
MPa 850 850 670 900 840 870
Minimal yield strengt MPa 520 520 520 520 520 520
Elongation
(typical value)
% 12 12 3 8 14 16
Young’s modulus
(average value)
GPa 320 320 300 330 340 340
Median coefficient of linear thermal expansion
20 – 100 °C
10-6/K 6.1 6.3 6.0 4.5 5.5 5.5
20 – 300 °C 10-6/K 6.2 6.5 6.2 5.1 5.7 5.7
20 – 450 °C 10-6/K 6.3 6.6 6.4 5.3 5.8 5.8
Thermal conductivity W/mK ≥70 ≥70 ≥90 ≥70 ≥75 ≥75
Electrical conductivity (average value) %IACS
MS/m
11
6.4
11
6.4
14
8.1
13
7.5
12
6.9
12
6.9
Specific electrical resistance
(average value)
µΩm 0.16 0.16 0.12 0.13 0.15 0.15
Permeability µ > 1.05 > 1.05 < 1.05 > 1.05 > 1.05 > 1.05

 

Inspection criterion HPM 1751 HPM 1760 HPM 1800 HPM 1810 HPM 1801 HPM 1850 HPM 1850W
Tungsten content % 92.5 92.5 95.0 95.0 95.0 97.0 97.0
Density g/cm³ 17.5 ± 0.2 17.6 ± 0.2 18.0 ± 0.2 18.0 ± 0.2 18.0 ± 0.2 18.5 ± 0.2 18.5 ± 0.2
Hardness HV 30 ≤ 325 ≤ 325 ≤ 332 ≤ 332 ≤ 332 ≤ 340 ≤ 340
Tensile strength
(typical value)
MPa 690 870 830 830 700 830 890
Minimal yield strengt MPa 520 520 520 520 520 520 520
Elongation
(typical value)
% 3 16 14 14 2 12 12
Young’s modulus
(average value)
GPa 330 340 370 370 330 380 380
Median coefficient of linear thermal expansion
20 – 100 °C
10-6/K 5.7 5.5 4.9 5.2 5.4 5.1 4.8
20 – 300 °C 10-6/K 5.8 5.8 5.1 5.3 5.5 5.1 4.9
20 – 450 °C 10-6/K 5.9 5.9 5.2 5.5 5.6 5.2 5.0
Thermal conductivity W/mK ≥85 ≥75 ≥80 ≥80 ≥85 ≥75 ≥80
Electrical conductivity (average value) %IACS
MS/m
15
8.5
12
6.9
13
7.7
13
7.7
15
9.0
16
9.3
16
9.3
Specific electrical resistance
(average value)
µΩm 0.12 0.15 0.14 0.14 0.11 0.10 0.10
Permeability µ < 1.05 > 1.05 > 1.05 > 1.05 < 1.05 > 1.05 > 1.05

 

Exceeds requirements of the following specifications: MIL-T-21014, ASTM B777 and AMS 7725

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