Just some background reading here from the past.
http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=21;t=000021 and
http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=56;t=000005
An element of the periodic table that can come in different forms is called an "allotrope."
Boron allotropes come in metallic and non-metallic versions. One type is a brown powder called, "amorphous boron" and is brown, while the metallic version is black.
The Oxford Dictionary of Chemistry will tell you that boron is an allotrope, while the McGraw-Hill Dictionary of Chemistry, and other simple dictionaries, will tell you it is a non-metallic element.
There are additive packages that combine potassiums and Borates, but I have never seen any calcium borate additive packages. This does not mean that additive makers have not or are not working on them.
There is also phosphorylated borates (used as AW additive in many ATF formulations).
There is also an additive that comes as a Borate Ester, that can be added as part of a PCMO or gear oil additive package.
But calcium in PCMO's and gear lubes are manufactured as high base, medium base, and low base calcium sulfonates for the purpose of being agents for setting tbn, as an AW additive/friction modifier, and as a rust and corroson inhibitor.
Here is a fairly comphrehensive list of additives that accomplish more than one task in a lubricant:
http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=56;t=000005
As an addendum, calcium and magnesium are considered to be part of the alkili-earth metals group. ANY metallic compound is usually ash forming. Calcium ashes are usually softer than other ash (organo-metallic) compounds.
[ July 01, 2006, 02:17 PM: Message edited by: MolaKule ]