Dental Casting Billet Material Melt Fluidity
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Solution Overview
Problem
The existing cobalt-chromium alloy pellets used in dental casting have low melt fluidity, making it difficult to fill metal melts into cavities with small gaps, which can result in incomplete casting and reduced mechanical properties of dental components.
Innovation Solution
A dental casting billet material with specific compositions, such as Co-Cr-Mo-Si or Ni-Cr-Mo-Si, formed from a sintered metal powder with controlled relative density and silicon oxide distribution, enhancing melt fluidity and mechanical properties while preventing explosive boiling during casting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Co-Cr alloy pellets are used for dental casting, then the alloy is readily available and has high chemical stability, but the metal melt has low fluidity making it difficult to fill cavities with small gaps
Solution Approach 1:
The invention changes the compositional parameters of the alloy by adding specific amounts of silicon (0.3-2.0 mass%) and molybdenum (5-12 mass%), and controlling chromium content (26-35 mass%). These parameter changes transform the melt properties to achieve high fluidity while maintaining chemical stability. The silicon and molybdenum additions specifically modify the melt viscosity and surface tension, enabling complete cavity filling.
Solution Approach 2:
The invention creates a composite alloy system combining Co, Cr, Mo, and Si elements with specific compositional ratios. This multi-element composite structure synergistically improves both chemical stability (from Cr and Mo) and melt fluidity (from Si and Mo), resolving the contradiction between these two properties that cannot be achieved with conventional single-phase Co-Cr alloys.
2Manufacturing precision
If the cavity gap is small, then the dental component achieves high precision, but the metal melt cannot enter the cavity completely due to low fluidity
Solution Approach 1:
By adjusting the alloy composition parameters (Si: 0.3-2.0 mass%, Mo: 5-12 mass%, Cr: 26-35 mass%), the invention optimizes the melt fluidity to a level that enables complete penetration into narrow cavity gaps while maintaining dimensional accuracy. The controlled composition ensures the melt can fill even the smallest gaps without compromising precision.
3Object-generated harmful factors
If silicon content is increased to improve melt fluidity, then the alloy becomes more prone to explosive boiling, but high silicon content degrades mechanical properties
Solution Approach 1:
The invention optimizes the silicon content to a specific range (0.3-2.0 mass%) that provides sufficient melt fluidity improvement without reaching the threshold for explosive boiling. Simultaneously, this controlled silicon level maintains mechanical properties by avoiding excessive silicon-induced embrittlement. The precise parameter control balances fluidity enhancement with structural integrity.
Solution Approach 2:
The invention applies silicon locally in controlled amounts within the alloy matrix, concentrating its fluidity-enhancing effect where needed while limiting its presence to levels that preserve mechanical strength. The localized optimization of silicon distribution and content achieves fluidity improvement without triggering explosive boiling or degrading overall alloy performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The billet material achieves high melt fluidity, ensuring complete cavity filling, improved mechanical properties, and enhanced adhesiveness to porcelain, resulting in high-quality dental components with reduced casting defects and increased reliability.
Implementation Method 1
formed from a sintered body of a metal powder
Data Source
AI summary
A dental casting billet material includes: Co as a main component; Cr in a proportion of 26% by mass or more and 35% by mass or less; Mo in a proportion of 5% by mass or more and 12% by mass or less; and Si in a proportion of 0.3% by mass or more and 2.0% by mass or less, wherein the billet material is formed from a sintered body of a metal powder, and the billet material has a relative density of 92% or more and 99.5% or less.